weird networking issues 2002-08-20 - By Michael Stack
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All,
I 'm having several very strange problems with my network. To wit:
(1) My computer has named itself "guinness ", with no apparent input from me.
Now, this machine used to be a windows machine named "guinness ", but during
the course of RH 7.3 installation, I blew away the WinXP partition (which
contained the "guinness " hostname configuration) and replaced it with my
ext3 partition (yay!). The machine used to be called guinness, but I can 't
figure out how RH knew that. Regardless, I 'd prefer that the machine fetch
it 's hostname from RoadRunner, which is what the machine did when I had RH
7.1 installed several moons ago. I guess what I 'm saying is that I 'm less
interested in understanding how it got named that way as I am interested in
getting it to pick up its name via DHCP (though I definitely *would* like to
know how it thought it should name itself "guinness "!)
(2) I 've had iptables (via "firestarter ") running on my machine for a couple
of days now, along with ip forwarding. My network consists of two machines -
a RH 7.3 machine with two network cards - eth0, which connects directly to
the Internet via RoadRunner, and picks up its IP address via dhcp, and eth1,
which has its IP address hard-coded to 10.0.0.1, and runs dhcpd for client
machines which wish to connect to the network, doling out ip addresses in
the 10.0.0.2 to 10.0.0.30 range. I 've had this working for several days
without any problems.
However, just a few hours ago, I rebooted the machine. I should point out
that this isn 't the first time I 've rebooted the machine with these
settings, and in previous reboots, everything came up fine. However, on my
last reboot, my console was getting flooded with messages that looked
something like this:
"Aug 18 04:23:46 IN=blah blah blah OUT=baah "
These messages never went to my console before. They looked similar to
messages that I 've seen in /var/log/messages in the past, but to be honest,
I didn 't get a really good look at them.
Now for the weirdest part - my WinXP machine on the network is able to
obtain an IP addr from my RH machine (10.0.0.2), and is able to access the
Internet (web, mail, etc). However, the RH machine cannot!! It can resolve
ip addresses from hostnames, but when I try to ping/telnet/http to a machine
on the Internet, I get a timeout error. I just don 't understand how this can
be, when the XP machine which uses the Linux machine as a sort of router can
access the Internet, but the RH machine itself cannot!
Any suggestions would be greatly appreciated. Thanks.
Thanks very much in advance.
Michael Stack
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