Re: [vox-tech] Can't reach a specific subnet
Any luck on resolving this or is it still an issue? I notice both domain names resolve to the same IP (169.237.167.248) and I cannot traceroute to that IP right now. It stops at the router 128.120.7.174. Keep in mind it is summer and that is the time of all things "deferred maintenance" (aka the stuff they don't want to do during the term as it might break things when people need the systems for courses and grading) at many a state university. I work at a CSU and the entire campus was offline two nights ago and very laggy yesterday as they worked on network maintenance in the break between Spring and Summer quarters. You might want to check if there was network maintenance scheduled the weekend you noticed the issue. You should also verify that the DNS->IP mapping is correct. This stands out to me as a likely culprit, as it would allow your existing connection (using the correct IP address) to continue working while preventing any new connections (since they'd be using the incorrect IP address). If you don't know what the correct IP addresses are and you still have the existing connection open, use /sbin/ifconfig to get the information. If you closed the existing connection, you'll need to physically go to the machines and run that command on the local console. Compare the IP addresses to what dig returns. If there's a mismatch, you'll need to contact IT about sorting it out. On Mon, 13 Jun 2011, Alex Mandel wrote: > Last night while I was in the middle of working remotely, I couldn't > make any new connections to any of my 3 servers. The rest of the world > seems to be able to and it didn't drop my existing connection that I had > open in a terminal. > > The servers in question can be checked by pulling up ice.ucdavis.edu or > maps.ice.ucdavis.edu > > Right now I can't ping, trace, ssh or load websites from any of them > from my home connection via a netgear router and comcast internet > service. Traceroute seems to make it most of the way, I can get to other > servers in the same room on a different subnet. > > Could this be a firewall somewhere, a bad routing table? > Problem is on at least 2 machines on my home network, both Ubuntu. Guess > I should try a house-mates windows machine but I have the suspicion it's > on the other end. I need at least some testable ideas before I can ask > the IT staff and get a reasonable response. > > Thanks, > Alex > ___ > vox-tech mailing list > vox-tech@lists.lugod.org > http://lists.lugod.org/mailman/listinfo/vox-tech > ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] Can't reach a specific subnet
My best guess is the my router SPI firewall decided it didn't like something about that subnet. I ended up converting one of my routers to open source firmware and it's all working again. For those that want the details I wrote it up on my blog. http://blog.wildintellect.com/blog/tomato Thanks, Alex On 06/18/2011 03:47 PM, Shwaine wrote: > Any luck on resolving this or is it still an issue? I notice both domain > names resolve to the same IP (169.237.167.248) and I cannot traceroute > to that IP right now. It stops at the router 128.120.7.174. > > Keep in mind it is summer and that is the time of all things "deferred > maintenance" (aka the stuff they don't want to do during the term as it > might break things when people need the systems for courses and grading) > at many a state university. I work at a CSU and the entire campus was > offline two nights ago and very laggy yesterday as they worked on > network maintenance in the break between Spring and Summer quarters. You > might want to check if there was network maintenance scheduled the > weekend you noticed the issue. > > You should also verify that the DNS->IP mapping is correct. This stands > out to me as a likely culprit, as it would allow your existing > connection (using the correct IP address) to continue working while > preventing any new connections (since they'd be using the incorrect IP > address). If you don't know what the correct IP addresses are and you > still have the existing connection open, use /sbin/ifconfig to get the > information. If you closed the existing connection, you'll need to > physically go to the machines and run that command on the local console. > Compare the IP addresses to what dig returns. If there's a > mismatch, you'll need to contact IT about sorting it out. > > On Mon, 13 Jun 2011, Alex Mandel wrote: > >> Last night while I was in the middle of working remotely, I couldn't >> make any new connections to any of my 3 servers. The rest of the world >> seems to be able to and it didn't drop my existing connection that I had >> open in a terminal. >> >> The servers in question can be checked by pulling up ice.ucdavis.edu or >> maps.ice.ucdavis.edu >> >> Right now I can't ping, trace, ssh or load websites from any of them >> from my home connection via a netgear router and comcast internet >> service. Traceroute seems to make it most of the way, I can get to other >> servers in the same room on a different subnet. >> >> Could this be a firewall somewhere, a bad routing table? >> Problem is on at least 2 machines on my home network, both Ubuntu. Guess >> I should try a house-mates windows machine but I have the suspicion it's >> on the other end. I need at least some testable ideas before I can ask >> the IT staff and get a reasonable response. >> >> Thanks, >> Alex >> ___ >> vox-tech mailing list >> vox-tech@lists.lugod.org >> http://lists.lugod.org/mailman/listinfo/vox-tech >> ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
[vox-tech] Can't reach a specific subnet
Last night while I was in the middle of working remotely, I couldn't make any new connections to any of my 3 servers. The rest of the world seems to be able to and it didn't drop my existing connection that I had open in a terminal. The servers in question can be checked by pulling up ice.ucdavis.edu or maps.ice.ucdavis.edu Right now I can't ping, trace, ssh or load websites from any of them from my home connection via a netgear router and comcast internet service. Traceroute seems to make it most of the way, I can get to other servers in the same room on a different subnet. Could this be a firewall somewhere, a bad routing table? Problem is on at least 2 machines on my home network, both Ubuntu. Guess I should try a house-mates windows machine but I have the suspicion it's on the other end. I need at least some testable ideas before I can ask the IT staff and get a reasonable response. Thanks, Alex ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
