[vox-tech] Can't reach a specific subnet

[Alex Mandel]

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 <domain_name> 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
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