[RndTbl] no routing entry for loopback
Gilles Detillieux
grdetil at scrc.umanitoba.ca
Wed Nov 23 13:10:04 CST 2005
Dan Martin wrote:
> I have installed Fedora Core 4 on my firewall machine. My networked
> machines can browse the web, but I cannot access the loopback device,
> eg, for SWAT configuration.
>
> ifconfig lo
> shows the loopback interface to be UP and RUNNING at inet addr 127.0.0.1
>
> ping localhost
> results in 100% packet loss
>
> The routing tables do not show a loopback entry, and if I try to add one
> I get errors.
>
> Can anyone tell me what's going on?
Not entirely, but here's a bit of info that might help. I just did a
"netstat -r" on Red Hat 9, FC1, FC3 and FC4. On RH9 & FC1, "lo" appears
in the routing table output by netstat, while on FC3 & 4 it doesn't.
Maybe it's a 2.6 kernel thing, but for whatever reason it seems "lo"
doesn't need to be in the routing table for FC3 & 4. I tried "ping
localhost" on 2 different FC4 systems, though, as well as 1 FC3 system,
and all worked fine. They all have a fairly default configuration of
iptables on them, as setup by system-config-securitylevel.
It might be worth a look at your own iptables configuration to see if
something is amiss there, especially if you're running a non-standard
(from a RH/Fedora perspective) setup.
--
Gilles R. Detillieux E-mail: <grdetil at scrc.umanitoba.ca>
Spinal Cord Research Centre WWW: http://www.scrc.umanitoba.ca/
Dept. Physiology, U. of Manitoba Winnipeg, MB R3E 3J7 (Canada)
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