if y is your gateway, there is the possibility that it's handling doing that
via iptables. if this is the case then you might need to manually
re-establish the packet forwarding between that machine and the local
network.
it's been a while for me but it's something like:
echo 1 > /proc/sys/net/ipv4/ip_forward
which of course is typed as root in a console on Y
regards, brett
On Thursday 09 December 2004 09:52, [EMAIL PROTECTED] wrote:
> Hi - how's things? =)
>
> We recently had a huge blackout in the midst of a number of violent
> electrical storms, and it lasted long enough for the UPS battery supply to
> drain, so our servers died uncleanly (I have'nt set up anything to listen
> for the UPS's warnings)...
>
> Since then we have had problems with our network.
>
> Here is a basic rundown of the setup
>
>
> [ A ] [ B ] [ C ] LOCAL NETWORK
>
> |_________|_________|
>
> [ X ] [ Y ] [ Z ] SERVERS
>
> |______|______|
>
> [ P ] SWITCH
>
>
> [ Q ] ROUTER
>
>
> { Internet }
>
>
> ( I hope this email preservers the mono-space text... if you can't make it
> out, you know why!! =) change the font to so mono-spaced thing)
>
> As I (hope) you can see we have our local network, which is where all our
> workstations are. IP Addresses are in the 10.0.0. class.
>
> Our main server is the [ Y ] server, and has a 202.22.*.* IP address. It's
> a webserver, and holds our main webpages, CGI, MySQL etc. etc. , The other
> servers [ X ] [ Z ] etc. are various servers ranging from webservers to
> mail servers.
>
> The switch [ P ] is a simple 12 port 10/100 switch. Nothing special about
> it.
>
> [ Q ] is some crazy router setup that was in place before my time, and we
> are actually replacing it sometime in the (relatively) near future. It
> goes straight to the local backbone. Good Internet connection =)
>
> --------------
>
> Normally we run everything from the local network, we browse the net,
> collect emails, pay bills, and use the back-end pages from the [ Y ]
> server to administer the main web site. [ Y ] is our gateway to the rest
> of the world, through the [ Q ] router etc.
>
> Since the blackout however, something has gone wrong. We cannot get past
> the [ Y ] server from our local machines. The [ Y ] server CAN get out to
> the internet, and so can [ X ] [ Z ] and co. No problems from there on
> out. The internet can also still see our [ X Y Z ] servers no problems. We
> [ A B C ] can also see the [ Y ] Server, but nothing else. We can't see [
> X ] [ Z ] or anything else past [ Y ] including [ P ] [ Q ] and the net.
>
> We have had a problem before that yielded similar results - when our
> 'bind' (/named) instance died. If that happened we couldn't see past [ Y ]
> unles of course we used IP addresses, until we restarted 'named'. It would
> happen spontaneously and was a real pain, something we still haven't
> figured out (if you have any ideas on that one, please let me know too) -
> but our main problem ATM is this other thing.
>
> We can't get past [ Y ] at all. No IP addresses, nothing.
>
> I am not experienced enough at Linux to know what I can do to overcome
> this, and I've tried!! - IP routing tables appear to be fine ( .. but
> maybe not ), 'named' is running perfectly, I've restarted the server 3 or
> so times, restarted 'named', restarted a number of things, but to no
> avail.
>
> What kind of program might be running that handles gateway functions -
> most likely NAT and the like ?? To my memory, I changed absolutely nothing
> that should effect our access to things beyond [ Y ]. !?
>
> If anyone has any ideas or solutions, I would LOVE to hear it! Even if
> it's just a theory u might have so I can check it out. Better than nothing
> right? - Also, please keep in mind I'm not extremely Linux savvy, so try
> to spell it out a bit for me. =)
>
> hehe..
>
> Thanks a lot for your time - sorry the question is a bit long-winded, but
> hopefully it's clear ;)
>
> Any queries on it, just drop me a line (email). Ta.
>
> Jared Pritchard
> [EMAIL PROTECTED]
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