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  • Are there any command line utilities which can calculate and/or limit how fast a pipe is running?

    - by stsquad
    I'm doing some basic stress testing of a Linux kernel network IWF with netcat. The set-up is fairly simple. On the target side: nc -l -p 10000 > /dev/null And on my desktop I was running: cat /dev/urandom | nc 192.168.0.20 10000 I'm using urandom for some poor-mans fuzz testing. However I find that even at this rate I can break something quite quickly. EDIT So I've been playing with trickle to rate limit how fast I'm generating data: cat /dev/urandom | trickle -u 10 nc 192.168.0.20 10000 But it's hard to tell if this is working. What would be really useful is a the pv equivilent of trickle that can work with pipes.

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  • MySQL/Apache: Replace spaces with underscores only in certain URLs

    - by javipas
    I'm having a problem with some images I'm using on my WordPress blog. After a migration I renamed every image replacing spaces with underscores, so HIDDEN_264_4062_FOTO_IDF los MID.jpg was renamed to HIDDEN_264_4062_FOTO_IDF_los_MID.jpg But althought the trick was necessary and worked for most of the posts, some of them try to find the old image, with spaces: This is not found http://www.example.com/files/HIDDEN_264_4062_FOTO_IDF%20los%20MID.jpg and this should be the right URL http://www.example.com/files/HIDDEN_264_4062_FOTO_IDF_los_MID.jpg Careful, though, 'cause the "%20" is only shown on the browser: the text on the database shows spaces, not "%20". I'd like to know if maybe I could make a SQL query in my WordPress MySQL database that replaces spaces in .jpg files with underscores. The path of the images is always the same, so the rule should transform this: /files/HIDDEN_264_4062_FOTO_IDF los MID.jpg /files/HIDDEN_264_4062_FOTO_IDF_los_MID.jpg the "/files/HIDDEN_264_" part is always the same, but the rest varies. Is some way to perform this? Maybe a rewrite rule on Apache (our current webserver)?

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  • One samba directory is very slow

    - by Tim Rosser
    We have a RHEL server running as a samba server for our Windows network which has been running fine for ages. All of a sudden this morning one specific folder became really slow and sometimes inaccessible. It's the /home/ directory (containing all of the user specific stuff, like their windows desktops, documents etc). It's not only really slow over the network, but when I try to use ls to view the directory it just hangs. I'm getting loads of messages like the following in /var/log/messages Mar 20 09:53:32 zeus smbd[32378]: [2012/03/20 09:53:32, 0] smbd/service.c:set_current_service(184) Mar 20 09:53:32 zeus smbd[32378]: chdir (/opt/shares/home/tim.rosser) failed

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  • Is Page-Loading Time Relevant?

    - by doug
    Take this (ServerFault) page for instance. It has about 20 elements. When the last of these has loaded, the page is deemed "loaded"--but not before. This is certainly the protocol used by our testing service (which is among the small group of well-known vendors that offer that sort of service). Obviously this method is based on a clear, definite endpoint--therefore it's easy to apply w/ concomitant reliability. I think it's also the metric used by the popular Firefox plugin, 'YSlow.' For my employer's website, nearly always the last-to-load items are tracking code, tracking pixels, etc., so from the user's point of view--their perception--the page was "loaded" well before it had actually loaded based on the criterion used by our testing service (15-20% is a rough estimate). I'm sure i'm not the first person to consider this nor the first to wonder if it is causing micro-optimization while ignoring overall system-level, or user-perceived performance. So my question is, are there are other more practical (yet still reasonably precise) measures of page loading time?

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  • NTP daemon or ntpdate doesn't synchronize

    - by user2862333
    I'm having some problems with synchronization with an NTP server. 1) The NTP daemon doesn't sync the system clock at all, even though it's running (confirmed with /etc/init.d/ntp status). Forcing to sync with ntpd -q or ntpd -gq does not work either. 2) Stopping the NTP daemon and syncing manually with ntpdate does give me the following output: ~# ntpdate -d 0.debian.pool.ntp.org 6 Nov 16:48:53 ntpdate[4417]: ntpdate [email protected] Sat May 12 09:07:19 UTC 2012 (1) transmit(79.132.237.5) receive(79.132.237.5) transmit(85.234.197.2) receive(85.234.197.2) transmit(194.50.97.34) receive(194.50.97.34) transmit(79.132.237.1) receive(79.132.237.1) transmit(79.132.237.5) receive(79.132.237.5) transmit(85.234.197.2) receive(85.234.197.2) transmit(194.50.97.34) receive(194.50.97.34) transmit(79.132.237.1) receive(79.132.237.1) transmit(79.132.237.5) receive(79.132.237.5) transmit(85.234.197.2) receive(85.234.197.2) transmit(194.50.97.34) receive(194.50.97.34) transmit(79.132.237.1) receive(79.132.237.1) transmit(79.132.237.5) receive(79.132.237.5) transmit(85.234.197.2) receive(85.234.197.2) transmit(194.50.97.34) receive(194.50.97.34) transmit(79.132.237.1) receive(79.132.237.1) server 79.132.237.5, port 123 stratum 2, precision -20, leap 00, trust 000 refid [79.132.237.5], delay 0.05141, dispersion 0.00145 transmitted 4, in filter 4 reference time: d624e3b1.f490b90d Wed, Nov 6 2013 16:50:09.955 originate timestamp: d624e457.eaaf787c Wed, Nov 6 2013 16:52:55.916 transmit timestamp: d624e36c.4a7036fd Wed, Nov 6 2013 16:49:00.290 filter delay: 0.08537 0.05141 0.05151 0.06346 0.00000 0.00000 0.00000 0.00000 filter offset: 235.6038 235.6087 235.6095 235.6068 0.000000 0.000000 0.000000 0.000000 delay 0.05141, dispersion 0.00145 offset 235.608782 server 85.234.197.2, port 123 stratum 2, precision -20, leap 00, trust 000 refid [85.234.197.2], delay 0.05151, dispersion 0.00336 transmitted 4, in filter 4 reference time: d624e3e7.dc6cd02b Wed, Nov 6 2013 16:51:03.861 originate timestamp: d624e458.1c91031f Wed, Nov 6 2013 16:52:56.111 transmit timestamp: d624e36c.7da1d882 Wed, Nov 6 2013 16:49:00.490 filter delay: 0.05765 0.07750 0.06013 0.05151 0.00000 0.00000 0.00000 0.00000 filter offset: 235.6048 235.6014 235.6035 235.6078 0.000000 0.000000 0.000000 0.000000 delay 0.05151, dispersion 0.00336 offset 235.607826 server 194.50.97.34, port 123 stratum 3, precision -23, leap 00, trust 000 refid [194.50.97.34], delay 0.03021, dispersion 0.00090 transmitted 4, in filter 4 reference time: d624e38d.2bce952c Wed, Nov 6 2013 16:49:33.171 originate timestamp: d624e458.4dbbc114 Wed, Nov 6 2013 16:52:56.303 transmit timestamp: d624e36c.b0d38834 Wed, Nov 6 2013 16:49:00.690 filter delay: 0.03030 0.03636 0.03091 0.03021 0.00000 0.00000 0.00000 0.00000 filter offset: 235.6095 235.6085 235.6098 235.6105 0.000000 0.000000 0.000000 0.000000 delay 0.03021, dispersion 0.00090 offset 235.610589 server 79.132.237.1, port 123 stratum 3, precision -20, leap 00, trust 000 refid [79.132.237.1], delay 0.05113, dispersion 0.00305 transmitted 4, in filter 4 reference time: d624dfcb.6acea332 Wed, Nov 6 2013 16:33:31.417 originate timestamp: d624e458.838672ad Wed, Nov 6 2013 16:52:56.513 transmit timestamp: d624e36c.e405181c Wed, Nov 6 2013 16:49:00.890 filter delay: 0.06345 0.05113 0.05681 0.05656 0.00000 0.00000 0.00000 0.00000 filter offset: 235.6087 235.6038 235.6010 235.6074 0.000000 0.000000 0.000000 0.000000 delay 0.05113, dispersion 0.00305 offset 235.603888 6 Nov 16:49:00 ntpdate[4417]: step time server 79.132.237.5 offset 235.608782 sec Clearly, ntpdate can reach the NTP server(s), but after checking the clock, it hasn't changed and is still displaying the wrong time. Any ideas what would be the problem would be much appreciated.

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  • DHCP and Reservations in windows server 2k3!!

    - by Fri13th
    Hello everybody! I have a problem with Configuring DHCP Reservations: in the client, ipconfig: Address Leases is: 192.168.188.20 http:/i160.photobucket.com/albums/t171/dungttvn/123.png then in the client computer: ipconfig /release but when i config the Reservations with the fix IP address is: 192.168.188.100 in the sever computer (throught vmnet1) and in the client computer: ipconfig /renew ... it's not work: the address lease is still 192.168.188.20 always! http:/i160.photobucket.com/albums/t171/dungttvn/456.png Someone help me! =.= Many Thanks!

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  • AWS:EC2:: Could not connect FTP client?

    - by heathub
    My Server OS: Amazon Linux I am trying to set up ftp. I have: Installed vsftpd open port 20-21 open port 1024 - 1048 Basically, I followed every of these steps Start vsftpd service (the status indicate [ok]) I use filezilla for my ftp client. Here is my setting/configuration: Host: ec2-XX-XX-XXX-XX.compute-1.amazonaws.com Port: -(blank, but I have tried 20 and 21 though) Server Type: FTP - File Transder Protocol Logon Type: Normal Username: (tried root and ec2-user) Transfer mode: Tried passive and active I always has this error: Status: Waiting to retry... Status: Resolving address of ec2-XX-XX-XXX-XX.compute-1.amazonaws.com Status: Connecting to XX.XX.XXX.XX:21... Error: Connection timed out Error: Could not connect to server Have I missed any configuration/settings? EDIT After execute the /sbin/iptables -L -n Here is the result: 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

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  • SQLite DB borked when opened on a different machine

    - by pruefsumme
    Hello, I'm using SQLite to store some data. The primary database is on a NAS (Debian Lenny, 2.6.15, armv4l) since the NAS runs a script which updates the data every day. A typical "select * from tableX" looks like this: 2010-12-28|20|62.09|25170.0 2010-12-28|21|49.28|23305.7 2010-12-28|22|48.51|22051.1 2010-12-28|23|47.17|21809.9 When I copy the DB to my main computer (Mac OS X) and run the same SQL query, the output is: 2010-12-28|20|1.08115035175016e-160|25170.0 2010-12-28|21|2.39343503830763e-259|-9.25596535779558e+61 2010-12-28|22|-1.02951149572792e-86|1.90359837597183e+185 2010-12-28|23|-1.10707273937033e-234|-2.35343828462275e-185 The 3rd and 4th column have the type REAL. Interesting fact: When the numbers are integer (i.e. they end with ".0"), there is no difference between the two databases. In all other cases, the differences are ... hm ... surprising? I can't seem to find a pattern. If someone's got a clue - please share!

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  • How do I route traffic to website using a spcified network connection on Windows 7

    - by rwetzeler
    I want to route all traffic to a website over my wireless connection while the rest of the traffic using my lan. What I tried was first finding out the IP address of the website I want to go to. For example, lets say pandora.com. I found it resolves to 208.85.40.20. I have entered that entry into my hosts file. I then added that route using route add 208.85.40.20 mask 255.255.255.255 WirelessIP. It doesn't seem to work however. Instead of using the IP address, is there a way that I can just say.. this URL to route over that connection? Does anyone know of a program that I can install that will do this.. possibly some sort of proxy or a software load balancer that can do this?

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  • Asterisk: forward if peer unreachable

    - by Cedric H.
    I would like to respond to incoming calls by checking is a specific peer is reachable, and dial the appropriate number accordingly. Presently I did this: exten => 1200,1,Answer() same => n,Set(reachable=${SHELL(asterisk -rx "sip show peers" | grep ^cedrich-phone.*OK)}) same => n,GotoIf($["${LEN(${reachable})}" = "0"]?extoffline) same => n,Dial(SIP/cedrich-phone,20) same => n(extoffline),Dial(SIP/another-phone,20,tr) same => n,Hangup() Could you tell me if this is acceptable and if it can be improved ?

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  • Cross subnet connection [closed]

    - by user30472
    My internal Windows 2008 AD network is 172.20.xxx.xxx My Apple Wireless base stations only allows DHCP 172.16.xxx.xxx Private IP address ranges: 10.0.0.0 to 10.255.255.255 172.16.0.0 to 172.31.255.255 192.168.0.0 to 192.168.255.255 The problem: The internet works from my IPad that has a 172.16.xxx.xxx address, but I can't access (browse) my tools server that is 172.20.xxx.xxx that host my Filemaker database. Is it possible to add 172.16.xxx.xxx range somewhere in DHCP or DNS on my Windows domain server so I can access tools? Or is there another way to make this connection work? Thanks

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  • network path not found error on creating schtasks

    - by user50273
    I am getting "ERROR: Network path was not found" when I try to create a scheduled task on my local machine. I am using this command at the command prompt: schtasks /tn taskname /tr taskpath /sc minute /mo 20 /sd 09/23/2010 /s \\%computername% /u username /p password When I give the above command without computername, username and password the task gets created perfectly fine. What am I doing wrong?? EDIT : I got it working by using the below command. I do not understand why it is working becuase I am using /ru and /rp which are remote user and remote password settings whereas I am executing the command on my local machine. And I had to give double quotes to computername. schtasks /tn taskname /tr taskpath /sc minute /mo 20 /sd 09/23/2010 /s "%computername%" /ru username /rp password

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  • 'IPv6' Newbie with IPv6 address assigment

    - by Cute Puppy
    I am new to IP v6 and I am looking to translate some existing private IPv4 addresses into v6 address assignment. Can someone please help me to answer/explain the questions below? If I have an v4 address of: 10.10.0.0/22 10.10.1.0/22 10.10.2.0/22 10.10.3.0/22 10.10.8.0/20 10.20.1.0/24 What will the new v6 address to be? I have been looking online @ http://www.subnetonline.com/pages/subnet-calculators/ipv4-to-ipv6-converter.php or other sites, Seems like they translated it directly to be: fe80::a0a:0 /118 fe80::a0a:100 /118 fe80::a0a:200 /118 fe80::a0a:300 /118 fe80::a0a:800 /118 fe80::a14:100 /120 Can someone please explain to me how we get to /118 from either "/22 or /24" (1. and 5) In addition, I would like to create the new private address based on the Unique local address "fc00::/16" How do I expand from there? Any help is greatly appreciated it!! Thanks,

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  • Cross subnet connection

    - by user30472
    My internal Windows 2008 AD network is 172.20.xxx.xxx My Apple Wireless base stations only allows DHCP 172.16.xxx.xxx Private IP address ranges: 10.0.0.0 to 10.255.255.255 172.16.0.0 to 172.31.255.255 192.168.0.0 to 192.168.255.255 The problem: The internet works from my IPad that has a 172.16.xxx.xxx address, but I can't access (browse) my tools server that is 172.20.xxx.xxx that host my Filemaker database. Is it possible to add 172.16.xxx.xxx range somewhere in DHCP or DNS on my Windows domain server so I can access tools? Or is there another way to make this connection work? Thanks

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  • What does directory permission 'S' mean? (not lower case, but in upper case)

    - by Howard Guo
    I downloaded Eclipse, uncompressed it, did a few other things and all sudden I notice this interesting behaviour: ^_^ ~/Downloads > sudo chmod 0000 eclipse/ ^_^ ~/Downloads > stat eclipse/ File: 'eclipse/' Size: 4096 Blocks: 8 IO Block: 4096 directory Device: 801h/2049d Inode: 529725 Links: 9 Access: (2000/d-----S---) Uid: ( 0/ root) Gid: ( 0/ root) Access: 2012-11-22 19:54:57.752017352 +1100 Modify: 2012-09-20 18:16:26.000000000 +1000 Change: 2012-11-22 20:07:49.354016510 +1100 Birth: - ^_^ ~/Downloads > sudo chmod 0755 eclipse/ ^_^ ~/Downloads > stat eclipse/ File: 'eclipse/' Size: 4096 Blocks: 8 IO Block: 4096 directory Device: 801h/2049d Inode: 529725 Links: 9 Access: (2755/drwxr-sr-x) Uid: ( 0/ root) Gid: ( 0/ root) Access: 2012-11-22 19:54:57.752017352 +1100 Modify: 2012-09-20 18:16:26.000000000 +1000 Change: 2012-11-22 20:08:19.042016478 +1100 Birth: - What does 'S' permission mean to a directory? And why it doesn't let me get rid of it? Thanks.

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  • iptables: separate clients from each other

    - by Florian Lagg
    Hello, is there a way to separate clients in a subnet so that they cannot reach each other? The infrastructure currently looks like this: 192.168.0.1/24 Gateway, a CentOS box with iptables. 192.168.0.10-20 Some clients which may reach each other 192.168.0.30 A single client which should not be able to reach the hosts 192.168.0.10-20 should be able to reach the gateway and the internet I don't know if it is possible, maybe you could give me your ideas how it could be done. I cannot influence the machine 192.168.0.30 because it is a virtual machine I want to rent to someone. Thanks.

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  • Stop sending packets to private IPs

    - by SlasherZ
    I have a problem that my server got locked down because it was sending packets to private IPs. My question is, what is the best solution to stop that? Here is the log that I got from my hosting provider: [Mon Jun 2 00:04:36 2014] forward-to-private:IN=br0 OUT=br0 PHYSIN=vm-44487.0 PHYSOUT=eth0 MAC=78:fe:3d:47:3d:20:00:1c:14:01:4e:cd:08:00 SRC=78.46.198.21 DST=192.168.249.128 LEN=1454 TOS=0x00 PREC=0x00 TTL=64 ID=58859 DF PROTO=UDP SPT=41366 DPT=41234 LEN=1434 [Mon Jun 2 00:17:15 2014] forward-to-private:IN=br0 OUT=br0 PHYSIN=vm-44487.0 PHYSOUT=eth0 MAC=78:fe:3d:47:3d:20:00:1c:14:01:4e:cd:08:00 SRC=78.46.198.21 DST=192.168.249.128 LEN=1456 TOS=0x00 PREC=0x00 TTL=64 ID=52234 DF PROTO=UDP SPT=55430 DPT=41234 LEN=1436

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  • How can I restrict my mates to stop downloading?

    - by user239295
    We are sharing an internet broadband connection with 6 users at a place we live. We get 20 gb fup ( Fair usage policy) with 2 mbps speed from the ISP after the 20 gb is consumed the speed comes down to 512 kbps very difficult to browse any page. The problem is we cannot track which user/mate is downloading and ending the FUP. it is very difficult to track so is there something that we can allot per user some amount of space like 2 gb of downloading or restrict all from downloading so that we can utilize all the fup till the end of the month. We are using this connection as wifi configured. A adsl router is configured as wifi and we all using all 6 laptops. No PC. Any help would be appreciated. I apologize if i am not clear with my question.

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  • centos 6 nfs: logs not showing anywhere

    - by ancillary
    Can someone please tell me where NFS logs in centos 6? Or perhaps where I can tell NFS to send logs? At the present time, there appears to be no such setting. Trying to get the thing to work without logs is quite frustrating. [root@houston netshare]# locate nfs| grep log [root@houston netshare]# [root@houston netshare]# grep -Rni "nfs" /var/log /var/log/anaconda.storage.log:23:20:41:33,962 DEBUG : registered device format class NFS as nfs /var/log/anaconda.storage.log:24:20:41:33,962 DEBUG : registered device format class NFSv4 as nfs4 This is a day-old centos 6 install from livecd and yum update has been run.

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  • selecting files in windows-7 explorer just by hovering

    - by bortao
    One of the biggest annoyances for me of Windows 7 vs Windows XP is that you cant select files properly by hovering over them on Windows Explorer (or multi select by holding ctrl). When i hover an item it gets light blue, not selected. Only after a time or after more hovering, it gets selected. I set the delay (MouseHoverTime) to 1. Windows seems to avoid wrong selection by requiring an additional time or space of mouse hovering before actually selecting the item. I tried playing with the values MouseHoverHeight, MouseHoverWidth, MouseSensitivity, MouseThreshold1 and MouseThreshold2 in HKEY_CURRENT_USER\Control Panel\Mouse, but they seem to have no effect over this. (they are currently on (20, 20, 16, 6, 10, respectively). What i want: to immediately select an item whenever the mouse gets over its bounds.

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  • Someone try to hack my site, want to understand the log

    - by garconcn
    I have a wordpress site hosted on CentOS 6. After see the following access log, I checked the server, it seems ok. Can anyone explain what does this guy trying to do? Did they get what they want? I have disabled allow_url_include, and restricted open_basedir to web dir and tmp(/etc is not in the path). 190.26.208.130 - - [05/Sep/2012:21:24:42 -0700] "POST http://my_ip/?-d%20allow_url_include%3DOn+-d%20auto_prepend_file%3D../../../../../../../../../../../../etc/passwd%00%20-n/?-d%20allow_url_include%3DOn+-d%20auto_prepend_file%3D../../../../../../../../../../../../etc/passwd%00%20-n HTTP/1.1" 200 32656 "-" "Mozilla/5.0"

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  • Spotify stopped scrobbling to libre.fm - unable to login

    - by dsolimano
    I've set Spotify up to scrobble to libre.fm using the hosts file hack, as specified on the wiki, adding these two entries to my hosts file. 149.20.54.250 post.audioscrobbler.com 149.20.54.250 ws.audioscrobbler.com This worked for a while. However, Spotify now tells me that it can't log in to libre.fm. I've double checked my username and password. I haven't changed anything else. Using nslookup confirms that the above names resolve to the correct IPs. So, how do I fix this?

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  • netgear GS108TV2 RSTP configuration

    - by jhowland
    I have a large set of GS108TV2 units--my goal is to set up a network which is comprised of several loops for redundancy/fault tolerance. I have a minimal 3 switch loop configured, with RSTP enabled on two ports on each switch. I have my bridge max age set to 6, and my bridge forward delay set to 4, which are the minimum values allowed. Hello time is fixed at 2 seconds. The switches respond to a cable being removed from a socket, but it takes too long. I cannot get the switch to respond to a loss of connection on one of the redundant ports in less than 20 seconds. Is there any way to configure these switches to respond faster than 20 seconds? That is unacceptable for my application. thanks in advance for any help

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  • Host data transfer limit calculations and network protocol headers

    - by UpTheCreek
    OK, this might be a really stupid question, but... I'm building a web app that utilises websockets. There's fairly rapid messaging going on, so I've been taking a look at the network traffic with wireshark, to see if there's any way of reducing the amount of data we are sending over the wire, and hence costs. A typical message has approx 150 byte data payload, and according to wireshark the lower layer stuff takes up about: Ethernet: 14 bytes IP: 20 Bytes TCP: 20 Bytes My question is, are these network headers included in data transfer calculations? What about TCP ACK messages? (another 54 bytes according to wireshark) This may seem petty, but because we have so much messaging going on, and because the payload is a similar size to these headers, it's significant.

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  • How to get Apache to follow symlink instead of downloading it?

    - by user792445
    I am just using the standard apache config file which mentions that it follows symlinks, but when I hit the url http://localhost/test it downloads the symlink file instead of following it. What config do I need to change to get apache to follow the symlink instead of downloading it? This is an ls on the directory: $ ls -al total 10 drwx------+ 1 SYSTEM SYSTEM 0 Oct 20 10:55 . drwx------+ 1 SYSTEM SYSTEM 0 Aug 26 12:27 .. -rw-r--r--+ 1 me None 47 Oct 20 10:14 index.html lrwxrwxrwx 1 me None 29 Oct 19 17:10 test -> /home/me/projects/test This is in my apache config file: <Directory "D:/Program Files (x86)/Apache Software Foundation/Apache2.2/htdocs"> Options Indexes FollowSymLinks AllowOverride None Order allow,deny Allow from all </Directory>

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