Unthinkable routing problem
Hi ,
This is regarding a routing problem that has cropped up since yesterday
(using potato). The setup is as follows
There are 3 entities involved in the configuration of the network
a)The Router which connects to the internet
b)The gateway which routes the packets for the entire network to the router
c)A system on the internal network which connects to the gateway and also
has multiple network interfaces for connecting the other LAN segments
The gateway system is running on Potato ver 2.2 kernel 2.2.15
The router is a zyxel prestige router.
Initially the setup was working fine. However yesterday there was a power
failure at the ISP which was down for 6 hours. When the ISP came up the
following peculiar behaviour was noticed on the gateway.
Also no configuration changes were made. We are also not clear if the
problem at the ISP has got something to do with this.
All the systems on the LAN are accessing the internet via the gateway and
router. However the gateway itself is not able to even ping/connect to the router
directly which is connected via a cross cable. In essence the forwarding is
ok but the connections on the local system ( gateway) is failing
Ipchains is installed on the machine and all the chains have a default
policy of ACCEPT. The things like the physical connectivity , routing with a
proper default route is working fine as the forwarding is ok.
This eliminates any issues with the n/w cards and the cables.
Anybody shed some light on this.
It is unthinkable for us that a machine can forward packets without itself
able to approach the router. !!!
Pl mail if you require more information on this.
Regards
Nagarjuna
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Nagarjuna G; Homi Bhabha Centre for Science Education, TIFR, Mumbai. INDIA
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