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• Unable to connect to shared (iscsitarget) dvd-rw drive on ubuntu karmic box

  - by Develop7

  Intro I have desktop with DVD-RW drive that runs primarily on Linux (namely Ubuntu 9.10). My wife has netbook that rins Windows XP with no cd/dvd drive. There's also LAN through our ADSL modem/router. I've "ported" (actually, I've just grabbed sources and ran dpkg-buildpackage) iscsitarget package from Ubuntu Lucid to Karmic (here are packages), installed it (sudo aptitude install iscsitarget; sudo m-a a-i iscsitarget) and configured it in the following way (/etc/ietd.conf): Target iqn.2020-01.local.develop7-desktop:storage.disc.dvdrw Lun 0 Path=/dev/sr0,Type=blockio #I've skipped commented lines Also, I've opened port 3260 with ufw: $ sudo ufw status | grep 3260 3260 ALLOW 192.168.1.0/24 Problem But (here's the trouble) I still can't connect to this target from Windows box. Microsoft Software iSCSI Initiator screams "Logon failure" upon connect attempt, and, respectively, fails to connect. After unsuccessful connection attempt I've noticed this line in dmesg | tail's output: iscsi_trgt: ioctl(299) invalid ioctl cmd c078690d Question So the question is — what's wrong with my config/iSCSI target/whatever else? Or, in short — what I'm doing wrong? Thanks in advance.

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• Allow access from outside network with dmz and iptables

  - by Ivan

  I'm having a problem with my home network. So my setup is like this: In my Router (using Ubuntu desktop v11.04), I installed squid proxy as my transparent proxy. So I would like to use dyndns to my home network so I could be access my server from the internet, and also I installed CCTV camera and I would like to enable watching it from internet. The problem is I cannot access it from outside the net. I already set DMZ in my modem to my router ip. My first guess is because i'm using iptables to redirect all inside network to use squid. And not allow from outside traffic to my inside network. Here is my iptables script: #!/bin/sh # squid server IP SQUID_SERVER="192.168.5.1" # Interface connected to Internet INTERNET="eth0" # Interface connected to LAN LAN_IN="eth1" # Squid port SQUID_PORT="3128" # Clean old firewall iptables -F iptables -X iptables -t nat -F iptables -t nat -X iptables -t mangle -F iptables -t mangle -X # Load IPTABLES modules for NAT and IP conntrack support modprobe ip_conntrack modprobe ip_conntrack_ftp # For win xp ftp client #modprobe ip_nat_ftp echo 1 > /proc/sys/net/ipv4/ip_forward # Setting default filter policy iptables -P INPUT DROP iptables -P OUTPUT ACCEPT # Unlimited access to loop back iptables -A INPUT -i lo -j ACCEPT iptables -A OUTPUT -o lo -j ACCEPT # Allow UDP, DNS and Passive FTP iptables -A INPUT -i $INTERNET -m state --state ESTABLISHED,RELATED -j ACCEPT # set this system as a router for Rest of LAN iptables --table nat --append POSTROUTING --out-interface $INTERNET -j MASQUERADE iptables --append FORWARD --in-interface $LAN_IN -j ACCEPT # unlimited access to LAN iptables -A INPUT -i $LAN_IN -j ACCEPT iptables -A OUTPUT -o $LAN_IN -j ACCEPT # DNAT port 80 request comming from LAN systems to squid 3128 ($SQUID_PORT) aka transparent proxy iptables -t nat -A PREROUTING -i $LAN_IN -p tcp --dport 80 -j DNAT --to $SQUID_SERVER:$SQUID_PORT # if it is same system iptables -t nat -A PREROUTING -i $INTERNET -p tcp --dport 80 -j REDIRECT --to-port $SQUID_PORT # DROP everything and Log it iptables -A INPUT -j LOG iptables -A INPUT -j DROP If you know where did I miss, please advice me. Thanks for all your help and I really appreciate it.

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• Why can't I route to some sites from my MacBook Pro that I can see from my iPad?

  - by Robert Atkins

  I am on M1 Cable (residential) broadband in Singapore. I have an intermittent problem routing to some sites from my MacBook Pro—often Google-related sites (arduino.googlecode.com and ajax.googleapis.com right now, but sometimes even gmail.com.) This prevents StackExchange chat from working, for instance. Funny thing is, my iPad can route to those sites and they're on the same wireless network! I can ping the sites, but not traceroute to them which I find odd. That I can get through via the iPad implies the problem is with the MBP. In any case, calling M1 support is... not helpful. I get the same behaviour when I bypass the Airport Express entirely and plug the MBP directly into the cable modem. Can anybody explain a) how this is even possible and b) how to fix it? mella:~ ratkins$ ping ajax.googleapis.com PING googleapis.l.google.com (209.85.132.95): 56 data bytes 64 bytes from 209.85.132.95: icmp_seq=0 ttl=50 time=11.488 ms 64 bytes from 209.85.132.95: icmp_seq=1 ttl=53 time=13.012 ms 64 bytes from 209.85.132.95: icmp_seq=2 ttl=53 time=13.048 ms ^C --- googleapis.l.google.com ping statistics --- 3 packets transmitted, 3 packets received, 0.0% packet loss round-trip min/avg/max/stddev = 11.488/12.516/13.048/0.727 ms mella:~ ratkins$ traceroute ajax.googleapis.com traceroute to googleapis.l.google.com (209.85.132.95), 64 hops max, 52 byte packets traceroute: sendto: No route to host 1 traceroute: wrote googleapis.l.google.com 52 chars, ret=-1 *traceroute: sendto: No route to host traceroute: wrote googleapis.l.google.com 52 chars, ret=-1 ^C mella:~ ratkins$ The traceroute from the iPad goes (and I'm copying this by hand): 10.0.1.1 119.56.34.1 172.20.8.222 172.31.253.11 202.65.245.1 202.65.245.142 209.85.243.156 72.14.233.145 209.85.132.82 From the MBP, I can't traceroute to any of the IPs from 172.20.8.222 onwards. [For extra flavour, not being able to access the above appears to stop me logging in to Server Fault via OpenID and formatting the above traceroutes correctly. Anyone with sufficient rep here to do so, I'd be much obliged.]

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• Configuration for Router Behind Uverse 2Wire

  - by Nori

  I have a 2Wire Uverse router(RG). I'm not particularly fond of it and want to use it as a modem only. I have a Linksys router with Tomato firmware on it and want that to be configured as the router. Most of the "guides" I've seen in my searches has been to enable DMZ Plus mode, but I don't see a way to make that work while my router has a static IP address. I played with it for quite some time yesterday and didn't see a way to get it to work. Then I ran across a setting in broadband for configuring another network. I played with that for a little bit but ran out of time and couldn't get it to work. So my question is for anyone out there who has Uverse and successfully setup a Tomato based firmware router behind the RG. How did you get it configured? I'm sure if I continued playing with it I could get it to work, but if someone out there already has it working then that would make my life easier. Thoughts? Thanks.

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• Suspected Router problems, [closed]

  - by jordon_user

  I am new to this forum. I appreciate any help you can offer. I have been troubleshooting an error with both my WIRED Internet Connection I have 3 desktops running through this working connection (Router) with no problems. Two computers, one laptop and desktop experience the issue. If I connect directly to the Modem, on either, no problem on the internet. Through the Router, my computer connects for a period of time but if ever awaking my comp, or restarting, the yellow explanation mark returns. The only way I can get the connection up = cmd. ipconfig /release, ipconfig /renew. This constant command is annoying and was hoping for a permanent fix. Audio is also not working. I know its likely a driver error, but its an old comp we put together and if there's an easy fix itd be great to hear from you! If you need any more info just let me know. Thanks! THanks guys!

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• OpenSSL: how to setup an OCSP server for checking third-party certificates?

  - by StackedCrooked

  I am testing the Certificate Revocation functionality of a CMTS device. This requires me to setup a OCSP responder. Since it will only be used for testing I assume that the minimal implementation provided by OpenSSL should suffice. I have extracted the a certificate from a cable modem, copied it to my PC and converted it to the PEM format. Now I want to register it in the OpenSSL OCSP database and start a server. I have completed all these steps, but when I do a client request my server invariably responds with "unknown". It seems to be completely unaware of my certificate's existence. I would greatly appreciate if anyone would be willing to have a look at my code. For your convenience, I have created a single script consisting of a sequential list of all used commands, from setting up the CA until starting the server: http://code.google.com/p/stacked-crooked/source/browse/trunk/Misc/OpenSSL/AllCommands.sh You can also find the custom config file and the certificate that I am testing with: http://code.google.com/p/stacked-crooked/source/browse/trunk/Misc/OpenSSL/ Any help would be greatly appreciated.

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• OpenSSL: how to setup an OCSP server for checking third-party certificates?

  - by StackedCrooked

  I am testing the Certificate Revocation functionality of a CMTS device. This requires me to setup a OCSP responder. Since it will only be used for testing I assume that the minimal implementation provided by OpenSSL should suffice. I have extracted the a certificate from a cable modem, copied it to my PC and converted it to the PEM format. Now I want to register it in the OpenSSL OCSP database and start a server. I have completed all these steps, but when I do a client request my server invariably responds with "unknown". It seems to be completely unaware of my certificate's existence. I would greatly appreciate if anyone would be willing to have a look at my code. For your convenience, I have created a single script consisting of a sequential list of all used commands, from setting up the CA until starting the server: http://code.google.com/p/stacked-crooked/source/browse/trunk/Misc/OpenSSL/AllCommands.sh You can also find the custom config file and the certificate that I am testing with: http://code.google.com/p/stacked-crooked/source/browse/trunk/Misc/OpenSSL/ Any help would be greatly appreciated.

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• Workflow engine BPMN, Drools, etc or ESB?

  - by Tom

  We currently have an application that is based on an in-house developed workflow engine with YAML based DSL. We are looking to move parts of it to Java. I have discovered a number of java solutions like Intalio, JBPM, Drools Expert, Drools Flow etc. They appear to be aimed at businesses where the business analyst creates the workflows using a graphical editor and submits them to the workflow engine. They seem geared towards ease of use for non-technical people rather than for developers with a focus on human interaction. The workflows tend to look like. Discover-a-file -\ -> join -> process-file -> move-file -> register-file Discover-some-metadata -/ If any step fails we need to retry it X times. We also need to be able to stop the system and be able to restart it and have it continue from where it was (durable). Some of our workflows can be defined by a set of goals we need to achieve so Jess's backwards rule chaining sounds interesting but it is not open source. It might be that what we are after is a Finite State Machine engine or just an Enterprise Service Bus and do everything as JMS queues. Is there a good open source workflow engine that is both standards-based but also geared towards developers. We don't particular want to use a graphical workflow designer or write reams of XML and it should ideally be in Java or language agnostic (makes REST/Soap calls to external services). Thanks, Tom

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• Opening port 80 in router has no results

  - by Ricardo Pieper

  A friend of mine has a ADSL modem and I need to forward some ports. I have already forwarded the 1521 port (Oracle) and it's working fine. Now I need to forward the port 80. I already set up his IIS bindings to this port, and also forwarded the port like this video shows: https://www.youtube.com/watch?v=DLKD-fyexoo So I think I did everything correctly. The local IP address is also the same as the machine where the IIS server is running. I'm sorry, but I can't post images since i don't have 10 points :( Somehow I can't forward this port, yougetsignal.com keeps saying that the door is closed. When I try to open the port, the Control Panel says me that I have to access the control panel in the 8080 port, because the 80 port will be open. Ok, that's fine. But I'm still able to access it in the 80 port, and when I try to access it in the 8080 port, it doesn't work. I'm trying it with the TPLINK 8816, but I also tried to open it in the Opticom DsLink 279, and it didn't worked (using another machine), I got the exact same results. He has a dynamic IP address, but he is also using No-ip, so I can always access his Oracle database in a certain static address. The 1521 port is open. I also tried to disable the firewall in Windows, but that makes no sense to me, since the router doesn't really open the port 80. Clearly I'm missing something. I have never done it in my life, so I dont know how to proceed. Restarting the router was the first I did, no results. I'm accessing his laptop through TeamViewer, so I'm testing the port outside his local network. Edit: My ISP says that they allow to open ports, and the 1521 port is opened. What could I do to open the 80 port?

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• Java Swing over Remote Desktop - Strange, weird GUI squashing

  - by ADTC

  I thought this question fits SuperUser more than StackOverflow because it's not about actual Java programming, though programmers might be more likely to encounter the problem. Anyway, let me start of with some stats before I ask the actual question: Laptop: Windows 7 x32 Screen resolution 1024 x 768; Nvidia GeForce Go 6200 Connected to desktop via ad-hoc wireless network Access internet via desktop Desktop: Windows 7 x64 Screen resolution 1920 x 1080 Connected to laptop via ad-hoc wireless network Access internet via cable modem I'm connecting to my laptop via Remote Desktop from my desktop to take advantage of the large screen. I'm doing programming on my laptop (for portability reasons). Everything else runs smooth and fast over Remote Desktop as both computers are connected directly over the ad-hoc wireless. The only problem is this: Java Swing apps don't display the GUI properly. I acquired a Java Swing application and I'm debugging it in Eclipse. Here's what I got when I ran the app: Apparently there doesn't seem to be anything wrong with the GUI application I'm debugging, because the Java Control Panel exhibits the same problem. I've searched high and low in Google about this; the closest I came to a solution is this. But sadly, the use of -Dsun.java2d.nodraw=true has no effect at all. This only happens over Remote Desktop. I have tried locally and the GUI apps display properly. This isn't a dealbreaker for me as I can stop using Remote Desktop when developing Java Swing apps. However, I would like to know if anyone has encountered this and found any solution. PS: All software involved (Eclipse, Java JRE, etc.) are latest versions.

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• Why my 2nd ip from traceroute is not answering the ping anymore?

  - by Pedro77

  My Internet is really laggy today, I did a tracerout and I realize that I'm having no answer from an ip at the beginning of the traceroute. see: Tracing route to 12.129.202.154 over a maximum of 30 hops 1 <1 ms <1 ms <1 ms 192.168.0.1 2 * * * Request timed out. 3 8 ms 8 ms 8 ms bd044008.virtua.com.br [189.4.64.8] 4 9 ms 8 ms 8 ms bd044009.virtua.com.br [189.4.64.9] 5 26 ms 26 ms 24 ms embratel-T0-1-5-0-tacc01.cas.embratel.net.br [200.174.243.21] 6 360 ms 15 ms 12 ms ebt-T0-15-0-12-tcore01.ctamc.embratel.net.br [200.244.140.218] 7 330 ms 349 ms 261 ms ebt-Bundle-POS11942-intl04.mianap.embratel.net.br [200.230.220.10] 8 139 ms 141 ms 139 ms sl-st30-mia-.sprintlink.net [144.223.64.221] Connection diagram: PC - Router configured as access point - Router (192.168.0.1) - Cable modem (192.168.100.1). Well, I think it is odd that the 2nd ip is not returning the ping. I looked some old tracerout logs to see what was the 2nd ip. The ip was: 10.19.0.1 So, what this 2nd ip stand for? How can I find why it is not answering the ping? I don't understand it, if does not answer the ping, how can the packets continue (yeah newbie question)? edit: well, because the hope 3 have a ping of 8 ms the hop 2 request time out should really not be a problem. But it is still odd that the 2nd hop stopped to answer ping request. So my doubts are: 1. Were the ip 10.19.0.1 is from? 2. Why it stopped to answer ping requests? 3. How can hop 7 be smaller than 6 and 8 smaller than 7 and 6!?? Shouldn't the pings be higher for each hop? Like: hop 3 time should be the sum of the hops before it plus its own time (hop 3 = 1+2+3) ??

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• Speeding up Outlook Express on Windows XP over satellite

  - by John

  My brother is in the field with Doctors Without Borders. I'm posting this question on his behalf. We use outlook express (on a pc running windows XP) and a 9600 baud dial up satellite phone modem to get our email direct from the server in Paris. As this is a very expensive way to communicate (our satellite bill is $50K a year, no joke), it seems like trying to streamline is a good idea. Here's the question- when we connect, the sequence goes: Send outbox mails. This goes pretty quickly, probably 10-15 seconds for each email, up to maybe a couple minutes for an email of 150k or so). The status bar moves pretty quickly, according to the emails sent. The system then says "Checking for new messages on (our account name), and "Receiving list of messages from server". This takes a long time. Like 10-15 minutes. The status bar crawls along. Then it receives the messages. "Receiving messages from server". Again, each message takes 10-15 seconds, and this part moves along reasonably fast. I'm curious as to what is going on in the second part. It takes forever, and doesn't seem to be part of the sending or receiving messages themselves. Is there a way to speed up the process by changing a preference with communicating with the server or something? Does anyone have any advice for him speeding up what Outlooks Express is doing? Obviously his software is ancient and adding more software is not realistic based on the connection speed. Thanks!

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• SCM8014 to FVS338

  - by Jack

  I have a SMC8014 Router/Modem that Comcast provided me with their business class service. It was not filtering malicious traffic as aggressively as I had hoped, so I purchased a NetGear ProSafe FVS338, and put this behind the SMC8014, and all my machines behind that. After some brief configuration, all machines can see out to the internet. I also have a single web server, and I have not been able to configure things so that incoming requests can reach it. This is where I need help! I would like to have the FVS339 do NAT, so that I can assign a 192.168 address to my webserver. I've tried everything I know of, and I can't get things going. I set the SMC8014 to have a LAN facing IP of 10.0.0.1, and I assigned the FVS339 a WAN facing IP of 10.0.0.2. I would like to be able to tell the SMC8014 to just forward all traffic to 10.0.0.2, but I haven't had any success. In my (unfortunately limited) understanding, what I probably want here is a static route, but I don't know how to cofigure one, or if this is really what I want. The SMC8014 wants a Destination IP, a Subnet Mask and a Gateway IP. Any help would be appreciated.

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• ISA Server dropping packets as it believes they are spoofed

  - by RB

  We have ISA Server 2004 running on Windows Server 2003 SP2. It has 2 NICs - one internal called LAN on 192.168.16.2, with a subnet of 255.255.255.0, and one external called WAN on 93.x.x.2. The default gateway is 93.x.x.1 (our modem). This machine also accepts VPN connections. We are having a problem with a scanner, which is trying to save a scan into a network share. Every time we try to scan, ISA Server logs the following Denied Connection Log type: Firewall service Status: A packet was dropped because ISA Server determined that the source IP address is spoofed. Rule: Source: Internal ( 192.168.16.54:1024) Destination: Internal ( 192.168.16.255:137) Protocol: NetBios Name Service Pinging 192.168.16.54 from the ISA Server works fine. In ISA Server, going into Configuration → Networks, there are 5 Networks : - External (inbuilt) - Internal (defined as 192.168.16.0 → 192.168.16.255) - Local Host (inbuilt) - Quarantined VPN Clients (inbuilt) - VPN Clients (inbuilt) Finally, under Network Connections → Advanced → Advanced Settings..., the connections are in the following order : - LAN - WAN - [Remote Access Connections] If we try to scan onto a workstation it works fine. Please let me know if you need any more info - many thanks. RB.

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• How to setup Mac server to use two gateways

  - by Brady

  I recently asked this question: How to set Mac server to use different Gateway for internet bound traffic The answer given works but has presented me with another issue that I didnt make clear in that question. Here is my network layout as it stands: At the moment outside staff members use some services on the existing internet 1 link. Those services are hosted by the Mac server. If I change the gateway of the Mac server to the second modem those outside staff lose visabilty on those services. Now I dont know how to go about solving this issue. I want the second link to be used when the Mac server goes to rsync data offsite but everything else use link one. How do I do this? Thanks Scott EDIT: This has been resolved by setting the default gateway on the Mac server to 192.168.1.254 Thus leaving everything on the network as it was before. but to get the Mac server to use the other link for rsync I've added a route to the Mac server to route traffic to the rsync server through the second gateway. sudo route add -net {server IP's}/{Netmask} 192.168.1.1 I've awarded the answer to gravyface for pointing me to a post on how to make this route persistant in Mac

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• PF, load balanced gateways, and Squid

  - by Santa

  Hi, So I have a FreeBSD router running PF and Squid, and it has three network interfaces: two connected to upstream providers (em0 and em1 respectively), and one for LAN (re0) that we serve. There is some load balancing configured with PF. Basically, it routes all traffic to ports 1-1024 through one interface (em0) and everything else through the other (em1). Now, I have a Squid proxy also running on the box that transparently redirects any HTTP request from LAN to port 3128 in 127.0.0.1. Since Squid redirects this request to HTTP outside, it should follow the load balancing rule through em0, no? The problem is, when we tested it out (by browsing from a computer in the LAN to http://whatismyip.com, it reports the external IP of the em1 interface! When we turn Squid off, the external IP of em0 is reported, as expected. How do I make Squid behave with the load balancing rule that we have set up? Here's the related settings in /etc/pf.conf that I have: ext_if1="em1" # DSL ext_if2="em0" # T1 int_if="re0" ext_gw1="x.x.x.1" ext_gw2="y.y.y.1" int_addr="10.0.0.1" int_net="10.0.0.0/16" dsl_ports = "1024:65535" t1_ports = "1:1023" ... squid=3128 rdr on $int_if inet proto tcp from $int_net \ to any port 80 -> 127.0.0.1 port $squid pass in quick on $int_if route-to lo0 inet proto tcp \ from $int_net to 127.0.0.1 port $squid keep state ... # load balancing pass in on $int_if route-to ($ext_if1 $ext_gw1) \ proto tcp from $int_net to any port $dsl_ports keep state pass in on $int_if route-to ($ext_if1 $ext_gw1) \ proto udp from $int_net to any port $dsl_ports pass in on $int_if route-to ($ext_if2 $ext_gw2) \ proto tcp from $int_net to any port $t1_ports keep state pass in on $int_if route-to ($ext_if2 $ext_gw2) \ proto udp from $int_net to any port $t1_ports Thanks!

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• Devices on one switch can't see devices on another switch

  - by jockey69

  I have RoadRunner Internet cable service hooked to a Motorola Surfboard modem. This is connected to a 10/100 wireless router (located in the garage). Downstairs, I have a ZyXEL GS-108b gigabit switch connected to one port on the router. From this switch I ran connections to a PS3, DVR, Vonage box and a wireless router (Buffalo AirStation 10/100). The Buffalo AirStation works as a wireless AP for other laptops, iPads and cell phones. Upstairs, I have an Asus gigabit switch connected to a gaming desktop, printer, and a media server on FreeNAS (PS3 Media Server on FreeNAS). The router is configured to assign static IPs to both the PS3 and the media server. Problem - I connect a laptop to the switch downstairs after disabling the wireless, thus making sure that I am accessing internet through the wired connection (and the router in the garage). All my computers, iPads and cell phones are able to connect to the internet without a problem. My PS3 connects to the interent with a wired connection but is unable to access the media server (I get a message that no media server is found). I used a wired laptop downstairs (connected to switch downstairs) but am unable to ping either the PS3 or media server! I may be doing something silly but am at my wits' end. Please help!

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• DNS server and fallback outside home

  - by Jens

  I have my own DNS server at home to access local names, and that is working fine. Then I have my laptop, now obviously my laptop leaves the home now and then, therefore it accesses different nets outside my home, and my DNS server is not accessible there... So I figured that I would just add Google as secondary DNS... But actually, when I do that, then suddenly I can't access my local stuff, the page won't resolve (at home that is, obviously), like my laptop is getting a quicker response from Google's DNS or something, because it can't find anything on the addresses I use locally. If I then remove the secondary DNS, and keeps my own, then it works fine again... So do I somehow need to seperate what DNS's to use on what nets? I already use sepperate DNS settings when I connect using my 3G modem, but when I use hotspots it seems to use the same settings regardless (at least in the train), also can it differ wired connections?... Is there another solution? OS: Windows 7 Ultimate, x64 EDIT: Currently trying this "hack/fix" out for the time being: http://blog.johnruiz.com/2011/12/windows-does-not-always-honor-dns-order.html

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• How do i set up a fully featured small business network?

  - by JoshReedSchramm

  This has the possibility to be a very large question but I recently acquired a few rack mount servers and the hardware necessary to run them. Unfortunately I'm a programmer with very little understanding of how to set up a good working network so I'm hoping someone on here might be able to help. What I want to do is run a domain with a series of subdomains which would all be externally accessible. The setup would live inside my home and my internet connection is your run of the mill cable model (which means a dynamic IP) I want to be able to set up a couple site, specifically: www.mycompany.com (mycompany.com with no subdomain would redirect to this) build.mycompany.com (for my continuous integration server) ruby.mycompany.com (for ruby projects) win.mycompany.com (for windows project) etc. Additionally this is still my home network so our personal machines need to be able to get on via wifi with at least the same security we have now through an out of the box router from best buy. I'm thinking i need a DNS server, DHCP server and one of those would run either no-ip or dyndns to accommodate the dynamic ip. I don't necessarily need mail but it might be helpful to have some sort of mail server i could use for testing, it doesn't need to get out to the greater internet though. So how do i set up this kinda of network? tl;dr Need to know how to set up your standard office style network in my home off my normal consumer level cable modem connection.

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• Does Guest WiFi on an Access Point make any sense?

  - by uos??

  I have a Belkin WiFi Router which offers a feature of a secondary Guest Access WiFi network. Of course, the idea is that the Guest network doesn't have access to the computers/devices on the main network. I also have a Comcast-issues Cable Modem/Router device with mutliple wired ports, but no WiFi-capabilities. I prefer to only run one router/DHCP/NAT instead of both the Comcast Router and the Belkin Router, so I can disable the Routing functions of the Belkin and allow the Comcast Router to But if I disable the Routing functions of the Belkin device, the Guest WiFi network is still available. Is this configuration just as secure as when the Belkin acts as a Router? I guess the question comes down to this: Do Guest WiFi's provide security by 1) only allowing requests to IPs found in-front of the device, or do they work by 2) disallowing requests to IPs on the same subnet? 1) Would mean that Guest WiFi on an access point provides no benefit 2) Would mean that the Guest WiFi functionality can work even if the device is just an access point. Or maybe something else entirely?

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• 4.0/WCF: Best approach for bi-idirectional message bus?

  - by TomTom

  Just a technology update, now that .NET 4.0 is out. I write an application that communicates to the server through what is basically a message bus (instead of method calls). This is based on the internal architecture of the application (which is multi threaded, passing the messages around). There are a limited number of messages to go from the client to the server, quite a lot more from the server to the client. Most of those can be handled via a separate specialized mechanism, but at the end we talk of possibly 10-100 small messages per second going from the server to the client. The client is supposed to operate under "internet conditions". THis means possibly home end users behind standard NAT devices (i.e. typical DSL routers) - a firewalled secure and thus "open" network can not be assumed. I want to have as little latency and as little overhad for the communication as possible. What is the technologally best way to handle the message bus callback? I Have no problem regularly calling to the server for message delivery if something needs to be sent... ...but what are my options to handle the messagtes from the server to the client? WsDualHttp does work how? Especially under a NAT scenario? Just as a note: polling is most likely out - the main problem here is that I would have a significant overhead OR a significant delay, both aren ot really wanted. Technically I would love some sort of streaming appraoch, where the server can write messags to a stream while he generates them and they get sent to the client as they come. Not esure this is doable with WCF, though (if not, I may acutally decide to handle the whole message part outside of WCF and just do control / login / setup / destruction via WCF).

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• Why can't I route to some sites from my MacBook Pro that I can see from my iPad? [closed]

  - by Robert Atkins

  I am on M1 Cable (residential) broadband in Singapore. I have an intermittent problem routing to some sites from my MacBook Pro—often Google-related sites (arduino.googlecode.com and ajax.googleapis.com right now, but sometimes even gmail.com.) This prevents StackExchange chat from working, for instance. Funny thing is, my iPad can route to those sites and they're on the same wireless network! I can ping the sites, but not traceroute to them which I find odd. That I can get through via the iPad implies the problem is with the MBP. In any case, calling M1 support is... not helpful. I get the same behaviour when I bypass the Airport Express entirely and plug the MBP directly into the cable modem. Can anybody explain a) how this is even possible and b) how to fix it? mella:~ ratkins$ ping ajax.googleapis.com PING googleapis.l.google.com (209.85.132.95): 56 data bytes 64 bytes from 209.85.132.95: icmp_seq=0 ttl=50 time=11.488 ms 64 bytes from 209.85.132.95: icmp_seq=1 ttl=53 time=13.012 ms 64 bytes from 209.85.132.95: icmp_seq=2 ttl=53 time=13.048 ms ^C --- googleapis.l.google.com ping statistics --- 3 packets transmitted, 3 packets received, 0.0% packet loss round-trip min/avg/max/stddev = 11.488/12.516/13.048/0.727 ms mella:~ ratkins$ traceroute ajax.googleapis.com traceroute to googleapis.l.google.com (209.85.132.95), 64 hops max, 52 byte packets traceroute: sendto: No route to host 1 traceroute: wrote googleapis.l.google.com 52 chars, ret=-1 *traceroute: sendto: No route to host traceroute: wrote googleapis.l.google.com 52 chars, ret=-1 ^C mella:~ ratkins$ The traceroute from the iPad goes (and I'm copying this by hand): 10.0.1.1 119.56.34.1 172.20.8.222 172.31.253.11 202.65.245.1 202.65.245.142 209.85.243.156 72.14.233.145 209.85.132.82 From the MBP, I can't traceroute to any of the IPs from 172.20.8.222 onwards. [For extra flavour, not being able to access the above appears to stop me logging in to Server Fault via OpenID and formatting the above traceroutes correctly. Anyone with sufficient rep here to do so, I'd be much obliged.]

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• How do I use a Minitel terminal as a linux dumb terminal

  - by Pawz

  I recently purchased a US version of the Alcatel Minitel terminal. I think it's a 1B version. Pictures of it here: I tried connecting a null modem to the 25 pin port on the back and plugging it into a linux box running agetty but I couldn't get it to show any signs of being connected. I used Google Translate to translate this document into English: http://mirabellug.org/wikini/upload/Documentations_minitel.pdf As far as I can tell, you take it out of videotex mode by typing Fcnt-T A, then turn off local echo with Fcnt-T E, then set it to 4800 baud with Fcnt-P 4. I presume Fcnt refers to the "CTRL" key on my terminal. But I think I'm doing something wrong, because it doesn't look like it's recognising the keystrokes, because "Fcnt-T A" just prints the letter A to the screen, which is not what you'd expect a function key combo to do. Has anyone used these minitel terminals as a linux terminal, and if so, please can you share how to configure the minitel to run as a terminal ? Is the 25 pin plug even the correct port to use ? I read something online that indicated you're supposed to use the 5 pin DIN plug instead, is that right ? If so, what's the 25 pin plug for ? If I am supposed to use the DIN plug, does anyone know the pinouts so I can make a cable ?

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• Cannot Resolve Host Or Access Website Through Router

  - by Boris_yo

  This is weird. I am on Windows XP with Edimax BR 6204Wg. I have 3 devices - 2 laptops and 1 smartphone. 1st laptop and smartphone are connected through WiFi to router and 2nd laptop is connected through LAN to router. Before firmware upgrade i did not try to access website but after firmware upgrade to latest version: http://www.edimax.eu/en/support_detail.php?pd_id=11&pl1_id=3#02 i had problems resolving host, pinging, tracerting and accessing website. Sometimes ping and tracert work but i cannot access website and sometimes i can access website but ping and tracert do not work. Weird? I downgraded to previous version and no changes. If i can no longer access that website through Internet Explorer, i can access it in Firefox. I tried deleting cookies, clearing cache and that seem not make difference. Switching LAN port did not make difference. When i disconnect router and connect laptop through LAN to internet modem, everything is normal. I tried resetting router, resetting to factory default settings and all did not help. At the moment i can access website on laptop connected through LAN from Firefox and Internet Explorer, but on my smartphone i can access website only with Opera but not with built-in browser and Skyfire. UPDATE: I just could only access with Internet Explorer but not with other browsers on my PC. Minutes later i could access with all browsers. But on smartphone i could only access with Opera and not with other browsers. I am confused. I also determined that sometimes i can access and sometimes can't. What is also weird is that when ping and tracert cannot resolve host, i still am able to access website.

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• Connection refused after installing vsftp on Ubuntu 8.04 with fail2ban

  - by Patrick

  I have been using an Ubuntu 8.04 server with fail2ban for a while now (12+ months) and using ftp over SSH without any problems. I have a new user that needs to put files onto the server from an IP modem. I have installed vsftp (sudo apt-get install vsftp) and everything installed correctly. I have created an ftp user on the server following this guide. Whenever I try to connect to the server with my ftp program (filezilla) I get an immediate response of: Connection attempt failed with "ECONNREFUSED - Connection refused by server". I have looked into fail2ban and cannot find any problems. The iptables setup is: Chain INPUT (policy ACCEPT) target prot opt source destination fail2ban-ssh tcp -- anywhere anywhere multiport dports ssh Chain FORWARD (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination Chain fail2ban-ssh (1 references) target prot opt source destination RETURN all -- anywhere anywhere VSFTP config file (commented lines removed) listen=YES anonymous_enable=NO local_enable=YES write_enable=YES dirmessage_enable=YES xferlog_enable=YES connect_from_port_20=YES chown_uploads=YES chown_username=[username] secure_chroot_dir=/var/run/vsftpd pam_service_name=vsftpd rsa_cert_file=/etc/ssl/certs/ssl-cert-snakeoil.pem rsa_private_key_file=/etc/ssl/private/ssl-cert-snakeoil.key Any ideas on what is preventing access to the server?

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