fixed length record - Page 11

Checking a record is due based on the 'occuring' field

- by andy

I have records that have dates against them and an occurring field that contains none,yearly and monthly id status note date last_updated occurring 1 open --- 01/01/2011 01/02/2010 yearly 2 open --- 05/05/2011 03/05/2011 monthly 3 open --- 06/06/2011 05/06/2011 none Now I need to be able to check if a record is due (the date set has passed) which works perfect if occurring is set to none but I'm unsure of how to approach it when it's set to yearly or monthly (IE: This day in the year/month has passed) So with the above records, if I had a method on the record called due? providing the status is 'open' it needs to return true every year when it's passed that date if it's not been updated within the year yet. I apologise if this is confusing but it's melting my brain just trying to think of it, let alone put it into words.

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Delete duplicate record from Sql Server 2005

This query is for deleting the duplicate record from table in SQl Server 2005 and above.

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DNS PTR record when domain on shared IP address

- by Marco Demaio

Hello, I own a typical shared IP hosting plan and domain. I can modify the DNS of the domain from the control panel. The mailserver shares the same IP address, so my typical DNS config is: www.mydomain.com A -> IP mydomain.com A -> IP ftp.mydomain.com A -> IP mail.mydomain.com A -> IP mydomain.com MX(10) -> IP I read some Q&A on this site where they suggest to add PTR record mainly for mailserver. I would like to add PTR record to my domain, I have got two questions: 1) can PTR record be added even if the hosting/mailserver are on a shared IP address? Or do I need a dedicated IP. 2) How do I setup PTR record, I mean does it look like A record: mydomain.com (PTR) -> myip

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Can a faulty DNS record prevent networking?

- by Bob

My server's network interfaces are not available anymore since yesterday evening. I didn't change anything, but I added a new DNS-record shortly before. Unfortunately, the web interface I used to add this DNS record escaped some characters, so I've got a faulty DNS record: example.com 86400 IN TXT "\"v=spf1 mx a -all\"" However, this is the only unusual thing I could notice about this. Is it possible that the \-characters in my DNS record are confusing for some routers? Or could it be the system itself which is confused by this (it's a Debian Lenny system). Unfortunately, I can't quick-test it because of the long TTL of the record.

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What's the proper format for an SPF record?

- by deltanovember

Querying my domain I get: The TXT records found for your domain are: v=spf1 ip4:50.22.72.198 a mx:wordswithfriends.net ~all So superficially it appears OK. However I also get the following message SPF records should also be published in DNS as type SPF records. No type SPF records found. I want to make sure things are absolutely airtight. So in addition to TXT records I also want a pure SPF record. However I cannot figure out the format. Placing the same text in an SPF record does not seem to work. Edit: At the moment I have a TXT record but not SPF record. When I cut and paste from TXT straight to SPF I get some type of crazy recursive DNS error so quickly deleted the SPF. I just want to know the correct format. Copying v=spf1 ip4:50.22.72.198 a mx:wordswithfriends.net ~all Straight into an SPF record doesn't work.

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Changing SPF (Sender Policy Framework) record for Google Apps

- by bobo

My boss asked me to set up Google Apps for a client and basically I have done everything including setting up MX records in DirectAdmin and re-creating the email accounts in Google Apps. I also sent a few test emails to ensure that it actually works and it seems fine. But then I discovered this article talking about changing the SPF record for the domain. http://www.google.com/support/a/bin/answer.py?answer=178723 After reading the introduction I think it would be better for me to change the SPF record according to this article. So I logged in to the DirectAdmin and navigated to the DNS management, and then I found that there's already a TXT SPF record there: v=spf1 a mx a:spf.cabin.com.hk include:gmail.com -all And it looks like it's already including gmail.com, but according to the article it should be: _spf.google.com rather than: gmail.com I dare not to change it before I understand what this record actually means. What would you do with this record if you were me?

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Updating a field in a record dyanamically in extjs

- by Daemon

Scenario I want to update the column data of particular record in grid having store with static data. Here is my store: : : extend : 'Ext.data.Store', model : 'MyModel', autoLoad:true, proxy: { type: 'ajax', url:'app/data/data.json', reader: { type: 'json', root: 'users' } }, My data.json { 'users': [ { QMgrStatus:"active", QMgrName: 'R01QN00_LQYV', ChannelStatus:'active', ChannelName : 'LQYV.L.CLNT', MxConn: 50 } ] } What I am doing to update the record : var grid = Ext.getCmp('MyGrid'); var store = Ext.getStore('Mystore'); store.each(function(record,idx){ val = record.get('ChannelName'); if(val == "LQYV.L.CLNT"){ record.set('ChannelStatus','inactive'); record.commit(); } }); console.log(store); grid.getView().refresh(); MY PROBLEM I am getting the record updated over here.It is not getting reflected in my grid panel.The grid is using the same old store(static).Is the problem of static data? Or am I missing something or going somewhere wrong? Please help me out with this issue.Thanks a lot. MY EDIT I am tryng to color code the column based on the status.But here I am always getting the status="active" even though I am updating the store. What I am trying to do in my grid { xtype : 'grid', itemId : 'InterfaceQueueGrid', id :'MyGrid', store : 'Mytore', height : 216, width : 600, columns : [ { text: 'QueueMgr Status', dataIndex: 'QMgrStatus' , width:80 }, { text: 'Queue Manager \n Name', dataIndex: 'QMgrName' , width: 138}, { text: 'Channel Status',dataIndex: 'ChannelStatus' , width: 78,align:'center', renderer: function(value, meta, record) { var val = record.get('ChannelStatus'); console.log(val); // Here I am always getting status="active". if (val == 'inactive') { return '<img src="redIcon.png"/>'; }else if (val == 'active') { return '<img src="greenIcon.png"/>'; } } }, { text: 'Channel Name', align:'center', dataIndex: 'ChannelName', width: 80} { text: 'Max Connections', align:'center', dataIndex: 'MxConn', width: 80} ] }

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HTTP Header - ntCoent-Length

- by DMcKenna

I get the following HTTP response headers in a particular response. All looks okay. However I have noticed that the content-length appears twice... Content-Length: 2424 ntCoent-Length: 2424 Is there a particular reason why the content-length is returned a second time as ntCoent-Length? HTTP/1.0 200 OK Date: Wed, 26 May 2010 09:38:19 GMT Server: Apache P3P: CP="NOI DSP COR CURa ADMa TA1a OUR BUS IND UNI COM NAV INT" Accept-Charset: iso-8859-1, unicode-1-1;q=0.8 Expires: Sun, 15 Jul 1990 00:00:00 GMT Pragma: no-cache Cache-Control: no-cache Content-Language: en ntCoent-Length: 2424 Connection: close Content-Type: text/html;charset=iso-8859-1 Content-Length: 2424

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Linux router: ping doesn't route back

- by El Barto

I have a Debian box which I'm trying to set up as a router and an Ubuntu box which I'm using as a client. My problem is that when the Ubuntu client tries to ping a server on the Internet, all the packets are lost (though, as you can see below, they seem to go to the server and back without problem). I'm doing this in the Ubuntu Box: # ping -I eth1 my.remote-server.com PING my.remote-server.com (X.X.X.X) from 10.1.1.12 eth1: 56(84) bytes of data. ^C --- my.remote-server.com ping statistics --- 13 packets transmitted, 0 received, 100% packet loss, time 12094ms (I changed the name and IP of the remote server for privacy). From the Debian Router I see this: # tcpdump -i eth1 -qtln icmp tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on eth1, link-type EN10MB (Ethernet), capture size 65535 bytes IP X.X.X.X > 10.1.1.12: ICMP echo reply, id 305, seq 7, length 64 IP 10.1.1.12 > X.X.X.X: ICMP echo request, id 305, seq 8, length 64 IP X.X.X.X > 10.1.1.12: ICMP echo reply, id 305, seq 8, length 64 IP 10.1.1.12 > X.X.X.X: ICMP echo request, id 305, seq 9, length 64 IP X.X.X.X > 10.1.1.12: ICMP echo reply, id 305, seq 9, length 64 IP 10.1.1.12 > X.X.X.X: ICMP echo request, id 305, seq 10, length 64 IP X.X.X.X > 10.1.1.12: ICMP echo reply, id 305, seq 10, length 64 IP 10.1.1.12 > X.X.X.X: ICMP echo request, id 305, seq 11, length 64 IP X.X.X.X > 10.1.1.12: ICMP echo reply, id 305, seq 11, length 64 ^C 9 packets captured 9 packets received by filter 0 packets dropped by kernel # tcpdump -i eth2 -qtln icmp tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on eth2, link-type EN10MB (Ethernet), capture size 65535 bytes IP 192.168.1.10 > X.X.X.X: ICMP echo request, id 360, seq 213, length 64 IP X.X.X.X > 192.168.1.10: ICMP echo reply, id 360, seq 213, length 64 IP 192.168.1.10 > X.X.X.X: ICMP echo request, id 360, seq 214, length 64 IP X.X.X.X > 192.168.1.10: ICMP echo reply, id 360, seq 214, length 64 IP 192.168.1.10 > X.X.X.X: ICMP echo request, id 360, seq 215, length 64 IP X.X.X.X > 192.168.1.10: ICMP echo reply, id 360, seq 215, length 64 IP 192.168.1.10 > X.X.X.X: ICMP echo request, id 360, seq 216, length 64 IP X.X.X.X > 192.168.1.10: ICMP echo reply, id 360, seq 216, length 64 IP 192.168.1.10 > X.X.X.X: ICMP echo request, id 360, seq 217, length 64 IP X.X.X.X > 192.168.1.10: ICMP echo reply, id 360, seq 217, length 64 ^C 10 packets captured 10 packets received by filter 0 packets dropped by kernel And at the remote server I see this: # tcpdump -i eth0 -qtln icmp tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes IP Y.Y.Y.Y > X.X.X.X: ICMP echo request, id 360, seq 1, length 64 IP X.X.X.X > Y.Y.Y.Y: ICMP echo reply, id 360, seq 1, length 64 IP Y.Y.Y.Y > X.X.X.X: ICMP echo request, id 360, seq 2, length 64 IP X.X.X.X > Y.Y.Y.Y: ICMP echo reply, id 360, seq 2, length 64 IP Y.Y.Y.Y > X.X.X.X: ICMP echo request, id 360, seq 3, length 64 IP X.X.X.X > Y.Y.Y.Y: ICMP echo reply, id 360, seq 3, length 64 IP Y.Y.Y.Y > X.X.X.X: ICMP echo request, id 360, seq 4, length 64 IP X.X.X.X > Y.Y.Y.Y: ICMP echo reply, id 360, seq 4, length 64 IP Y.Y.Y.Y > X.X.X.X: ICMP echo request, id 360, seq 5, length 64 IP X.X.X.X > Y.Y.Y.Y: ICMP echo reply, id 360, seq 5, length 64 IP Y.Y.Y.Y > X.X.X.X: ICMP echo request, id 360, seq 6, length 64 IP X.X.X.X > Y.Y.Y.Y: ICMP echo reply, id 360, seq 6, length 64 IP Y.Y.Y.Y > X.X.X.X: ICMP echo request, id 360, seq 7, length 64 IP X.X.X.X > Y.Y.Y.Y: ICMP echo reply, id 360, seq 7, length 64 IP Y.Y.Y.Y > X.X.X.X: ICMP echo request, id 360, seq 8, length 64 IP X.X.X.X > Y.Y.Y.Y: ICMP echo reply, id 360, seq 8, length 64 IP Y.Y.Y.Y > X.X.X.X: ICMP echo request, id 360, seq 9, length 64 IP X.X.X.X > Y.Y.Y.Y: ICMP echo reply, id 360, seq 9, length 64 18 packets captured 228 packets received by filter 92 packets dropped by kernel Here "X.X.X.X" is my remote server's IP and "Y.Y.Y.Y" is my local network's public IP. So, what I understand is that the ping packets are coming out of the Ubuntu box (10.1.1.12), to the router (10.1.1.1), from there to the next router (192.168.1.1) and reaching the remote server (X.X.X.X). Then they come back all the way to the Debian router, but they never reach the Ubuntu box back. What am I missing? Here's the Debian router setup: # ifconfig eth1 Link encap:Ethernet HWaddr 94:0c:6d:82:0d:98 inet addr:10.1.1.1 Bcast:10.1.1.255 Mask:255.255.255.0 inet6 addr: fe80::960c:6dff:fe82:d98/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:105761 errors:0 dropped:0 overruns:0 frame:0 TX packets:48944 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:40298768 (38.4 MiB) TX bytes:44831595 (42.7 MiB) Interrupt:19 Base address:0x6000 eth2 Link encap:Ethernet HWaddr 6c:f0:49:a4:47:38 inet addr:192.168.1.10 Bcast:192.168.1.255 Mask:255.255.255.0 inet6 addr: fe80::6ef0:49ff:fea4:4738/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:38335992 errors:0 dropped:0 overruns:0 frame:0 TX packets:37097705 errors:0 dropped:0 overruns:0 carrier:1 collisions:0 txqueuelen:1000 RX bytes:4260680226 (3.9 GiB) TX bytes:3759806551 (3.5 GiB) Interrupt:27 eth3 Link encap:Ethernet HWaddr 94:0c:6d:82:c8:72 UP BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) Interrupt:20 Base address:0x2000 lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:3408 errors:0 dropped:0 overruns:0 frame:0 TX packets:3408 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:358445 (350.0 KiB) TX bytes:358445 (350.0 KiB) tun0 Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 inet addr:10.8.0.1 P-t-P:10.8.0.2 Mask:255.255.255.255 UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1500 Metric:1 RX packets:2767779 errors:0 dropped:0 overruns:0 frame:0 TX packets:1569477 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:100 RX bytes:3609469393 (3.3 GiB) TX bytes:96113978 (91.6 MiB) # route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 10.8.0.2 0.0.0.0 255.255.255.255 UH 0 0 0 tun0 127.0.0.1 0.0.0.0 255.255.255.255 UH 0 0 0 lo 10.8.0.0 10.8.0.2 255.255.255.0 UG 0 0 0 tun0 192.168.1.0 0.0.0.0 255.255.255.0 U 1 0 0 eth2 10.1.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1 0.0.0.0 192.168.1.1 0.0.0.0 UG 0 0 0 eth2 # arp -n # Note: Here I have changed all the different MACs except the ones corresponding to the Ubuntu box (on 10.1.1.12 and 192.168.1.12) Address HWtype HWaddress Flags Mask Iface 192.168.1.118 ether NN:NN:NN:NN:NN:NN C eth2 192.168.1.72 ether NN:NN:NN:NN:NN:NN C eth2 192.168.1.94 ether NN:NN:NN:NN:NN:NN C eth2 192.168.1.102 ether NN:NN:NN:NN:NN:NN C eth2 10.1.1.12 ether 00:1e:67:15:2b:f0 C eth1 192.168.1.86 ether NN:NN:NN:NN:NN:NN C eth2 192.168.1.2 ether NN:NN:NN:NN:NN:NN C eth2 192.168.1.61 ether NN:NN:NN:NN:NN:NN C eth2 192.168.1.64 ether NN:NN:NN:NN:NN:NN C eth2 192.168.1.116 ether NN:NN:NN:NN:NN:NN C eth2 192.168.1.91 ether NN:NN:NN:NN:NN:NN C eth2 192.168.1.52 ether NN:NN:NN:NN:NN:NN C eth2 192.168.1.93 ether NN:NN:NN:NN:NN:NN C eth2 192.168.1.87 ether NN:NN:NN:NN:NN:NN C eth2 192.168.1.92 ether NN:NN:NN:NN:NN:NN C eth2 192.168.1.100 ether NN:NN:NN:NN:NN:NN C eth2 192.168.1.40 ether NN:NN:NN:NN:NN:NN C eth2 192.168.1.53 ether NN:NN:NN:NN:NN:NN C eth2 192.168.1.1 ether NN:NN:NN:NN:NN:NN C eth2 192.168.1.83 ether NN:NN:NN:NN:NN:NN C eth2 192.168.1.89 ether NN:NN:NN:NN:NN:NN C eth2 192.168.1.12 ether 00:1e:67:15:2b:f1 C eth2 192.168.1.77 ether NN:NN:NN:NN:NN:NN C eth2 192.168.1.66 ether NN:NN:NN:NN:NN:NN C eth2 192.168.1.90 ether NN:NN:NN:NN:NN:NN C eth2 192.168.1.65 ether NN:NN:NN:NN:NN:NN C eth2 192.168.1.41 ether NN:NN:NN:NN:NN:NN C eth2 192.168.1.78 ether NN:NN:NN:NN:NN:NN C eth2 192.168.1.123 ether NN:NN:NN:NN:NN:NN C eth2 # iptables -L -n Chain INPUT (policy ACCEPT) target prot opt source destination Chain FORWARD (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination # iptables -L -n -t nat Chain PREROUTING (policy ACCEPT) target prot opt source destination Chain POSTROUTING (policy ACCEPT) target prot opt source destination MASQUERADE all -- 10.1.1.0/24 !10.1.1.0/24 MASQUERADE all -- !10.1.1.0/24 10.1.1.0/24 Chain OUTPUT (policy ACCEPT) target prot opt source destination And here's the Ubuntu box: # ifconfig eth0 Link encap:Ethernet HWaddr 00:1e:67:15:2b:f1 inet addr:192.168.1.12 Bcast:192.168.1.255 Mask:255.255.255.0 inet6 addr: fe80::21e:67ff:fe15:2bf1/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:28785139 errors:0 dropped:0 overruns:0 frame:0 TX packets:19050735 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:32068182803 (32.0 GB) TX bytes:6061333280 (6.0 GB) Interrupt:16 Memory:b1a00000-b1a20000 eth1 Link encap:Ethernet HWaddr 00:1e:67:15:2b:f0 inet addr:10.1.1.12 Bcast:10.1.1.255 Mask:255.255.255.0 inet6 addr: fe80::21e:67ff:fe15:2bf0/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:285086 errors:0 dropped:0 overruns:0 frame:0 TX packets:12719 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:30817249 (30.8 MB) TX bytes:2153228 (2.1 MB) Interrupt:16 Memory:b1900000-b1920000 lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:86048 errors:0 dropped:0 overruns:0 frame:0 TX packets:86048 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:11426538 (11.4 MB) TX bytes:11426538 (11.4 MB) # route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 0.0.0.0 192.168.1.1 0.0.0.0 UG 0 0 0 eth0 0.0.0.0 10.1.1.1 0.0.0.0 UG 100 0 0 eth1 10.1.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1 10.8.0.0 192.168.1.10 255.255.255.0 UG 0 0 0 eth0 169.254.0.0 0.0.0.0 255.255.0.0 U 1000 0 0 eth0 192.168.1.0 0.0.0.0 255.255.255.0 U 1 0 0 eth0 # arp -n # Note: Here I have changed all the different MACs except the ones corresponding to the Debian box (on 10.1.1.1 and 192.168.1.10) Address HWtype HWaddress Flags Mask Iface 192.168.1.70 ether NN:NN:NN:NN:NN:NN C eth0 192.168.1.90 ether NN:NN:NN:NN:NN:NN C eth0 192.168.1.97 ether NN:NN:NN:NN:NN:NN C eth0 192.168.1.103 ether NN:NN:NN:NN:NN:NN C eth0 192.168.1.13 ether NN:NN:NN:NN:NN:NN C eth0 192.168.1.120 (incomplete) eth0 192.168.1.111 ether NN:NN:NN:NN:NN:NN C eth0 192.168.1.118 ether NN:NN:NN:NN:NN:NN C eth0 192.168.1.51 ether NN:NN:NN:NN:NN:NN C eth0 192.168.1.102 (incomplete) eth0 192.168.1.64 ether NN:NN:NN:NN:NN:NN C eth0 192.168.1.52 ether NN:NN:NN:NN:NN:NN C eth0 192.168.1.74 (incomplete) eth0 192.168.1.94 ether NN:NN:NN:NN:NN:NN C eth0 192.168.1.121 ether NN:NN:NN:NN:NN:NN C eth0 192.168.1.72 ether NN:NN:NN:NN:NN:NN C eth0 192.168.1.87 ether NN:NN:NN:NN:NN:NN C eth0 192.168.1.91 ether NN:NN:NN:NN:NN:NN C eth0 192.168.1.71 ether NN:NN:NN:NN:NN:NN C eth0 192.168.1.78 ether NN:NN:NN:NN:NN:NN C eth0 192.168.1.83 ether NN:NN:NN:NN:NN:NN C eth0 192.168.1.88 (incomplete) eth0 192.168.1.82 ether NN:NN:NN:NN:NN:NN C eth0 192.168.1.98 ether NN:NN:NN:NN:NN:NN C eth0 192.168.1.100 ether NN:NN:NN:NN:NN:NN C eth0 192.168.1.93 ether NN:NN:NN:NN:NN:NN C eth0 192.168.1.73 ether NN:NN:NN:NN:NN:NN C eth0 192.168.1.11 ether NN:NN:NN:NN:NN:NN C eth0 192.168.1.85 (incomplete) eth0 192.168.1.112 ether NN:NN:NN:NN:NN:NN C eth0 192.168.1.89 ether NN:NN:NN:NN:NN:NN C eth0 192.168.1.65 ether NN:NN:NN:NN:NN:NN C eth0 192.168.1.81 ether NN:NN:NN:NN:NN:NN C eth0 10.1.1.1 ether 94:0c:6d:82:0d:98 C eth1 192.168.1.53 ether NN:NN:NN:NN:NN:NN C eth0 192.168.1.116 ether NN:NN:NN:NN:NN:NN C eth0 192.168.1.61 ether NN:NN:NN:NN:NN:NN C eth0 192.168.1.10 ether 6c:f0:49:a4:47:38 C eth0 192.168.1.86 (incomplete) eth0 192.168.1.119 ether NN:NN:NN:NN:NN:NN C eth0 192.168.1.66 ether NN:NN:NN:NN:NN:NN C eth0 192.168.1.1 ether NN:NN:NN:NN:NN:NN C eth0 192.168.1.1 ether NN:NN:NN:NN:NN:NN C eth1 192.168.1.92 ether NN:NN:NN:NN:NN:NN C eth0 # iptables -L -n Chain INPUT (policy ACCEPT) target prot opt source destination Chain FORWARD (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination # iptables -L -n -t nat Chain PREROUTING (policy ACCEPT) target prot opt source destination Chain INPUT (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination Chain POSTROUTING (policy ACCEPT) target prot opt source destination Edit: Following Patrick's suggestion, I did a tcpdump con the Ubuntu box and I see this: # tcpdump -i eth1 -qtln icmp tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on eth1, link-type EN10MB (Ethernet), capture size 65535 bytes IP 10.1.1.12 > X.X.X.X: ICMP echo request, id 21967, seq 1, length 64 IP X.X.X.X > 10.1.1.12: ICMP echo reply, id 21967, seq 1, length 64 IP 10.1.1.12 > X.X.X.X: ICMP echo request, id 21967, seq 2, length 64 IP X.X.X.X > 10.1.1.12: ICMP echo reply, id 21967, seq 2, length 64 IP 10.1.1.12 > X.X.X.X: ICMP echo request, id 21967, seq 3, length 64 IP X.X.X.X > 10.1.1.12: ICMP echo reply, id 21967, seq 3, length 64 IP 10.1.1.12 > X.X.X.X: ICMP echo request, id 21967, seq 4, length 64 IP X.X.X.X > 10.1.1.12: ICMP echo reply, id 21967, seq 4, length 64 IP 10.1.1.12 > X.X.X.X: ICMP echo request, id 21967, seq 5, length 64 IP X.X.X.X > 10.1.1.12: ICMP echo reply, id 21967, seq 5, length 64 IP 10.1.1.12 > X.X.X.X: ICMP echo request, id 21967, seq 6, length 64 IP X.X.X.X > 10.1.1.12: ICMP echo reply, id 21967, seq 6, length 64 ^C 12 packets captured 12 packets received by filter 0 packets dropped by kernel So the question is: if all packets seem to be coming and going, why does ping report 100% packet loss?

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C#:How can I fixed a form size in win application and not to let user changes its size?

- by odiseh

C#:How can I fix a form size in win application and not to let user changes its size?

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How do I record video from a webcam in MATLAB?

- by Veronica

I would like to know how I can record a video in MATLAB with my webcam.

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How to make header row of a table (with horizontal and vertical scrollers) fixed ?

- by understack

I've this sample table and I want to make header row of table visible all the time. Header row should scroll with horizontal scrollbar and shouldn't scroll with vertical scrollbar. table: <div style="width:800px; height:150px;overflow:scroll;margin:50px auto;"> <table style="width:1600px" border="1"> <thead style=""> <tr> <th style="width:800px">id_1</th> <th style="width:800px">id_2</th> </tr> </thead> <tbody style=""> <tr><td>1200</td><td>1200</td></tr> <tr><td>1200</td><td>1200</td></tr> <tr><td>1200</td><td>1200</td></tr> <tr><td>1200</td><td>1200</td></tr> <tr><td>1200</td><td>1200</td></tr> <tr><td>1200</td><td>1200</td></tr> <tr><td>1200</td><td>1200</td></tr> <tr><td>1200</td><td>1200</td></tr> </tbody> </table> </div> How can I do this with css only? Suggestions in this and this thread didn't seem to work, possibly due to presence of scrollbars.

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Unlimited online backup space for fixed price using rsync/FTP/other simple protocol

- by barrycarter

Many companies offer unlimited online backup space for a fixed price (mozy.com, twitter.com/allmydata, onlinestoragesolution.com, etc), but they either use proprietary non-Linux-friendly software and/or have gone out of business and/or don't actually work. Who offers reliable unlimited online backup space for a fixed price that's compatible with rsync, FTP, or other generic/open source file transfer protocols? Or, has anyone written software that lets me treat Mozy's/etc space as though it were regular file space (eg, "mozyfs"?)

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Fixed width, free, sans serif fonts

- by The Journeyman geek

I'm a dyslexic and i generally use arial for most things, since its probably the most readable font for me. However i'd like to have a fixed width font with similar charecteristics (sans serif, distinct, 'simple' characters etc) since some things break with non fixed width fonts, but at the same time, most of the 'standard' fonts are harder to read for me- any suggestions?

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What is the point in using real time?

- by bobobobo

I understand that using real time frame elapses (which should vary between 16-17ms on average) are provided by a lot of frameworks. GetTimeElapsedSinceLastFrame, and it gives you the wall clock time. But should we use this information in basic physics simulation? It looks to me to be a bad idea. Say there is a slight lag on the machine, for whatever reason (say a virus scanner starts up). The calculations all jump, and there is no need for this. Why not use a virtual second and ignore wall clock time? For gameplay on the level of Commander Keen, shouldn't you always use the virtual second and not real-time? (Besides stopwatch timing for race games) I don't see a need to use real time and not a fixed 16ms time step.

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Examples of limitations in IT due to different bit length by design

- by Alaudo

I am teaching the course "Introduction in Programming" for the first-year students and would like to find interesting examples where the datatype size in bits, chosen by design, led to certain known restrictions or important values. Here are some examples: Due to the fact that the Bell teleprinter used 7-bit-code (later accepted as ASCII) until now have we often to encode attachments in electronic messages to contain only 7 bit data. Classical limitation of 32-bit address space leads to the 4Gb maximal RAM size available for 32-bit systems and 4Gb maximal file size in FAT32. Do you know some other interesting examples how the choice of the data type (and especially its binary length) influenced the modern IT world. Added after some discussion in comments: I am not going to teach how to overcome limitations. I just want them to know that 1 byte can hold the values from -127..0..+127 o 0..255, 2 bytes cover the range 0..65535 etc by proving examples they know from other sources, like the above-mentioned base64 encoding etc. We are just learning the basic datatypes and I am trying to find a good reference for "how large" these types are.

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Where do I subclass SC.Record?

- by Jake

I'm using SproutCore and going through the Todos tutorial on http://wiki.sproutcore.com/Todos+06-Building+with+Rails. SproutCore and Rails use different names for the primary key on a model (Sproutcore = 'guid', Rails = 'id'). The tutorial gives directions to Adjust Rails JSON output, but in my app that I'm planning on building, I cannot do this because sproutcore is only one of a couple interfaces used to interact with the Rails app. As an alternate option, the tutorial gives the following directions: Option 2: Set primaryKey in your Sproutcore model class You can subclass SC.Record and set the primaryKey of your sublcass to "id". Your Todo- Object then needs to extend from e.g. App.Rails.Record. App.Rails.Record = SC.Record.extend({ primaryKey : "id" // Extend your records from App.Rails.Record instead of SC.Record. }); Where should I subclass SC.Record (i.e. in what file) such that it is properly read and included?

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Insert Record by Drag & Drop from ADF Tree to ADF Tree Table

- by arul.wilson(at)oracle.com

If you want to create record based on the values Dragged from ADF Tree and Dropped on a ADF Tree Table, then here you go.UseCase DescriptionUser Drags a tree node from ADF Tree and Drops it on a ADF Tree Table node. A new row gets added in the Tree Table based on the source tree node, subsequently a record gets added to the database table on which Tree table in based on.Following description helps to achieve this using ADF BC.Run the DragDropSchema.sql to create required tables.Create Business Components from tables (PRODUCTS, COMPONENTS, SUB_COMPONENTS, USERS, USER_COMPONENTS) created above.Add custom method to App Module Impl, this method will be used to insert record from view layer. public String createUserComponents(String p_bugdbId, String p_productId, String p_componentId, String p_subComponentId){ Row newUserComponentsRow = this.getUserComponentsView1().createRow(); try { newUserComponentsRow.setAttribute("Bugdbid", p_bugdbId); newUserComponentsRow.setAttribute("ProductId", new oracle.jbo.domain.Number(p_productId)); newUserComponentsRow.setAttribute("Component1", p_componentId); newUserComponentsRow.setAttribute("SubComponent", p_subComponentId); } catch (Exception e) { e.printStackTrace(); return "Failure"; } return "Success"; }Expose this method to client interface.To display the root node we need a custom VO which can be achieved using below query. SELECT Users.ACTIVE, Users.BUGDB_ID, Users.EMAIL, Users.FIRSTNAME, Users.GLOBAL_ID, Users.LASTNAME, Users.MANAGER_ID, Users.MANAGER_PRIVILEGEFROM USERS UsersWHERE Users.MANAGER_ID is NULLCreate VL between UsersView and UsersRootNodeView VOs.Drop ProductsView from DC as ADF Tree to jspx page.Add Tree Level Rule based on ComponentsView and SubComponentsView.Drop UsersRootNodeView as ADF Tree TableAdd Tree Level Rules based on UserComponentsView and UsersView.Add DragSource to ADF Tree and CollectionDropTarget to ADF Tree Table respectively.Bind CollectionDropTarget's DropTarget to backing bean and implement method of signature DnDAction (DropEvent), this method gets invoked when Tree Table encounters a drop action, here details required for creating new record are captured from the drag source and passed to 'createUserComponents' method. public DnDAction onTreeDrop(DropEvent dropEvent) { String newBugdbId = ""; String msgtxt=""; try { // Getting the target node bugdb id Object serverRowKey = dropEvent.getDropSite(); if (serverRowKey != null) { //Code for Tree Table as target String dropcomponent = dropEvent.getDropComponent().toString(); dropcomponent = (String)dropcomponent.subSequence(0, dropcomponent.indexOf("[")); if (dropcomponent.equals("RichTreeTable")){ RichTreeTable richTreeTable = (RichTreeTable)dropEvent.getDropComponent(); richTreeTable.setRowKey(serverRowKey); int rowIndexTreeTable = richTreeTable.getRowIndex(); //Drop Target Logic if (((JUCtrlHierNodeBinding)richTreeTable.getRowData(rowIndexTreeTable)).getAttributeValue()==null) { //Get Parent newBugdbId = (String)((JUCtrlHierNodeBinding)richTreeTable.getRowData(rowIndexTreeTable)).getParent().getAttributeValue(); } else { if (isNum(((JUCtrlHierNodeBinding)richTreeTable.getRowData(rowIndexTreeTable)).getAttributeValue().toString())) { //Get Parent's parent newBugdbId = (String)((JUCtrlHierNodeBinding)richTreeTable.getRowData(rowIndexTreeTable)).getParent().getParent().getAttributeValue(); } else{ //Dropped on USER newBugdbId = (String)((JUCtrlHierNodeBinding)richTreeTable.getRowData(rowIndexTreeTable)).getAttributeValue(); } } } } DataFlavor<RowKeySet> df = DataFlavor.getDataFlavor(RowKeySet.class); RowKeySet droppedValue = dropEvent.getTransferable().getData(df); Object[] keys = droppedValue.toArray(); Key componentKey = null; Key subComponentKey = null; // binding for createUserComponents method defined in AppModuleImpl class to insert record in database. operationBinding = bindings.getOperationBinding("createUserComponents"); // get the Product, Component, Subcomponent details and insert to UserComponents table. // loop through the keys if more than one comp/subcomponent is select. for (int i = 0; i < keys.length; i++) { System.out.println("in for :"+i); List list = (List)keys[i]; System.out.println("list "+i+" : "+list); System.out.println("list size "+list.size()); if (list.size() == 1) { // we cannot drag and drop the highest node ! msgtxt="You cannot drop Products, please drop Component or SubComponent from the Tree."; System.out.println(msgtxt); this.showInfoMessage(msgtxt); } else { if (list.size() == 2) { // were doing the first branch, in this case all components. componentKey = (Key)list.get(1); Object[] droppedProdCompValues = componentKey.getAttributeValues(); operationBinding.getParamsMap().put("p_bugdbId",newBugdbId); operationBinding.getParamsMap().put("p_productId",droppedProdCompValues[0]); operationBinding.getParamsMap().put("p_componentId",droppedProdCompValues[1]); operationBinding.getParamsMap().put("p_subComponentId","ALL"); Object result = operationBinding.execute(); } else { subComponentKey = (Key)list.get(2); Object[] droppedProdCompSubCompValues = subComponentKey.getAttributeValues(); operationBinding.getParamsMap().put("p_bugdbId",newBugdbId); operationBinding.getParamsMap().put("p_productId",droppedProdCompSubCompValues[0]); operationBinding.getParamsMap().put("p_componentId",droppedProdCompSubCompValues[1]); operationBinding.getParamsMap().put("p_subComponentId",droppedProdCompSubCompValues[2]); Object result = operationBinding.execute(); } } } /* this.getCil1().setDisabled(false); this.getCil1().setPartialSubmit(true); */ return DnDAction.MOVE; } catch (Exception ex) { System.out.println("drop failed with : " + ex.getMessage()); ex.printStackTrace(); /* this.getCil1().setDisabled(true); */ return DnDAction.NONE; } } Run jspx page and drop a Component or Subcomponent from Products Tree to UserComponents Tree Table.

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Looking for an application to record audio and video on a linux "embedded" device

- by Luke404

I am working with a linux x86 device with limited CPU resources (as a prototype we just use a pentium-m netbook). We'd like to record video from one V4L2 device (we'll probably end up using just USB Video Class devices like all modern webcams) and one audio stream from an ALSA source. The thing will not have screen and keyboard, and obviously no X11 environment. Goals are: do as little work as possible to cope with little cpu resources - for example I'd like to record video in the native MJPEG I get out of the UVC devices encoding audio to MPEG3 Layer-2 (aka mp2) is ok since it let us save a lot of space (compared to raw pcm samples) and does use little cpu power I don't mind loosing some video frames here and there (UVC devices do that) as long as I can get audio and video streams syncronized not require user input to start the thing (a python script takes care of initialization, startup, shutdown, etc...) be able to open the resulting files for postprocessing without too much effort (ie, if mplayer or vlc can play it, it's fine) So far the only app I found that could be started from command line and record V4L2 video + ALSA audio is mencoder but I'm having some difficulties with it. It should be able to do that but I cannot record audio and video together - just one of the two. And if I use two different processes to record to two different files I have no means to get them in sync (audio is more or less always correct, but video framerate will vary over time and it seems to lack timestamps to correctly play it back to the correct time). Long story short, how do you record an unconverted MJPEG stream (from an UVC device) and an audio stream (from an ALSA device, possibly encoding to any standard format) using a command line tool, to a single file (MPEG or any other container), keeping audio and video in sync?

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Do you still limit line length in code?

- by Noldorin

This is a matter on which I would like to gauge the opinion of the community: Do you still limit the length of lines of code to a fixed maximum? This was certainly a convention of the past for many languages; one would typically cap the number of characters per line to a value such as 80 (and more recnetly 100 or 120 I believe). As far as I understand, the primary reasons for limiting line length are: Readability - You don't have to scroll over horizontally when you want to see the end of some lines. Printing - Admittedly (at least in my experience), most code that you are working on does not get printed out on paper, but by limiting the number of characters you can insure that formatting doesn't get messed up when printed. Past editors (?) - Not sure about this one, but I suspect that at some point in the distant past of programming, (at least some) text editors may have been based on a fixed-width buffer. I'm sure there are points that I am still missing out, so feel free to add to these... Now, when I tend to observe C or C# code nowadays, I often see a number of different styles, the main ones being: Line length capped to 80, 100, or even 120 characters. As far as I understand, 80 is the traditional length, but the longer ones of 100 and 120 have appeared because of the widespread use of high resolutions and widescreen monitors nowadays. No line length capping at all. This tends to be pretty horrible to read, and I don't see it too often, though it's certainly not too rare either. Inconsistent capping of line length. The length of some lines are limited to a fixed maximum (or even a maximum that changes depending on the file/location in code), while others (possibly comments) are not at all. My personal preference here (at least recently) has been to cap the line length to 100 in the Visual Studio editor. This means that in a decently sized window (on a non-widescreen monitor), the ends of lines are still fully visible. I can however see a few disadvantages in this, especially when you end up writing code that's indented 3 or 4 levels and then having to include a long string literal - though I often take this as a sign to refactor my code! In particular, I am curious what the C and C# coders (or anyone who uses Visual Studio for that matter) think about this point, though I would be interested in hearing anyone's thoughts on the subject. Edit Thanks for the all answers - I appreciate the variety of opinions here, all presenting sound reasons. Consensus does seem to be tipping in the direction of always (or almost always) limit the line length. Interestingly, it seems to be in various coding standards to limit the line length. Judging by some of the answers, both the Python and Google CPP guidelines set the limit at 80 chars. I haven't seen anything similar regarding C# or VB.NET, but I would be curious to see if there are ones anywhere.

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Should Javascript's "for in" construct iterate the length property?

- by Eric

I'm making a bookmarklet, but I've encountered some wierd behaviour in IE8. The code causing the problem is this: var els = document.getElementById("my_id").getElementsByTagName("*"); for(var i in els) { alert(i+","+els[i]) } The first thing that is alerted is "length, n". This isn't the case in chrome: just in IE8. Interestingly, it seems to behave differently depending on whether the code goes in the console/address bar or the page itself. Is this standard behaviour?

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max length of url 257 characters for mod_rewrite?

- by Daniel

My url scheme is /foo/var1-var2-var3.../bar I am using these mod_rewrite rules: RewriteBase /foo/ RewriteEngine on RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteRule ^ index.php [PT,L] If the length of the string 'var1-var2...' is greater than 257 characters then an error 403 Forbidden and a 404 are returned. However, if the length of the 'var1-var2...' string is 257 characters or less and subsequently followed by a slash the length of the remaining url may be any length. How does one overcome this limit?

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Max length of a USB Cable?

- by Click Ok

I want to use a very long USB cable to, for example, place a webcam in a different room. The max length that I found was 5 meters. What the max length of a USB cable and... What the max length that I can get using USB extension cables? Thanks in advance!

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Dry length of buoy in OrcaFlex

- by KAE

I use a software package called OrcaFlex to model the behavior of a buoy in ocean waves. I would like to share OrcaFlex questions in this forum - hope some users are out there! Here is a starter question: For a 6D buoy, I extracted the 'Dry Length' after the simulation completed. The value of the Dry Length sometimes slightly exceeds the actual height of the buoy, even though this would not seem to be possible given the formula from the manual, Dry Length = (cylinder length) × (cylinder volume above surface) / (cylinder total volume). Any insights?

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Adventures in Scrum: Lesson 2 - For the record

- by Martin Hinshelwood

At SSW we have always done Agile. Recently we have started doing Scrum and we have nearly completed our first Sprint ever using Scrum. As you probably guessed from my previous post, it looks like it is going to be a “Failed Sprint”, but the Scrum Team (This includes the ScrumMaster and the Product Owner) has learned a huge amount about working in the Scrum Framework. We have been running with a “Proxy Product Owner” for the last two weeks, but a simple mistake occurred either during the “Product Planning Meeting” or the “Sprint Planning Meeting” that could have prevented this Sprint from failing. We has a heated discussion on the vision of someone not in the room which ended with the assertion that the Product Owner would be quizzed again on their vision. This did not happen and we ran with the “Proxy Product Owner’s vision for two weeks. Product Owner vision: Update Component A of Product A to Silverlight Proxy Product Owner vision: Update Product A to Silverlight Do you see the problem? Worse than that, as we had a lot of junior members of the Scrum Team and we are just feeling our way around how Scrum will work at SSW I missed implementing a fundamental rule. That’s right, it was me. It does not matter that I did not know about this rule, its on the site and I should have read it. Would a police officer let you off if you did not know that a red light meant stop? I think not… But, what is this amazing rule I hear you shout.. Its simple, as per our rule I should have sent the following email: “ Dear Proxy Product Owner, For the record, I disagree that the Product Owner wants us to ‘Update Product A to Silverlight’ as I still think that he wants us to ‘Update Component A of Product A to Silverlight’ and not the entire application. Regards Martin” - ‘For the record’ - Rules to being Software Consultants - Dealing with Clients This email should have been copied to the entire Scrum Team, which would have included the Product Owner, who would have nipped this misunderstanding in the bud and we would have had one less impediment. Technorati Tags: SSW,SSW Rules,SSW Standards,Scrum,Product Owner,ScrumMaster,Sprint,Sprint Planning Meeting,Product Planning Meeting

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