[H-GEN] Routing Problem

[Tim Browne]

Andrew,

Is your ADSL modem running in bridged mode (fixed IP address). If so 
eth0 may be picking up this address.

Tim Browne.




Andrew Pullin wrote:

>[ Humbug *General* list - semi-serious discussions about Humbug and     ]
>[ Unix-related topics. Posts from non-subscribed addresses will vanish. ]
>
>Hi All,
>    I am having a frustrating time getting a new server up and going. The
>problem seems to be strange entries in the routing table that are being
>automagically set, but I cannot identify from where, since I cannot find any
>config file that would be automagically loaded.
>
>    The server is a PII 266 with 64Mb RAM (I know - processing overkill and
>memory starved, but it is only temporary). I have two 10/100 PCI Ethernet
>cards, both RT8139 based (they were identical cards, but in the interests of
>frustration, I lashed out and bought a different one to try and solve the
>problem). These connect to a network switch and an ADSL router.
>
>    The software is a minimal install RH 9.0 (OK so I know RH better than
>any distro, it may not be the best, but I know it or thought I did). The
>installation went fine, and both network cards were correctly detected, and
>configured for a /28 subnet as follows:
>
>    eth0    203.*.*.162 mask 255.255.255.240 bcast 203.*.*.175
>    eth1    203.*.*.163 mask 255.255.255.240 bcast 203.*.*.175
>
>the idea being, 162 connects to the ADSL modem configured as 161, and 163
>being connected to the network switch and the box acting as a firewall
>webserver.
>
>ifconfig eth0 & eth1 both return the correct configuration and both cards
>are at different addresses and irqs so no conflicts there.
>
>Other config files are as such:
>
>/etc/sysconfig/network
>    NETWORKING=yes
>    FORWARD_IPV4=yes
>    HOSTNAME=machine.mydomain.com.au
>    GATEWAY=203.*.*.161
>
>/etc/sysctl.conf
>    net.ipv4.ip_forward=1
>    net.ipv4.ip_always_defrag=1
>
>Now the frustrating part. I can ping both interfaces and the home network
>from the firewall as I should be able to do. I can ssh into 162 ONLY which
>is partially correct as the bridge is not yet set up, but I CANNOT ssh into
>163. I have tried network cable swaps but to no avail. I have looked at the
>default routing table set up by the machine, and there are some strange
>entries I don't understand:
>
>route -n
>
>Dest                    Gateway        Genmask        Flags    Metric    REF
>USE
>203.*.*.160        0.0.0.0     255.255.255.240    U        0            0
>0        eth1
>203.*.*.160        0.0.0.0     255.255.255.240    U        0            0
>0        eth1
>169.254.0.0        0.0.0.0     255.255.0.0            U        0
>0        0        eth1
>127.0.0.0            0.0.0.0     255.0.0.0                U        0
>0        0        lo
>0.0.0.0        203.*.*.161     0.0.0.0                    UG     0
>0        0        eth1
>
>As you can see, there are two things that jump right out: where is eth0
>interface that is correctly set up elsewhere?, and where did 169.254.0.0
>come from? What is stranger is that when I manually delete everything except
>lo and create the correct entries and interfaces, eth0 still dissapears. The
>routing table I was expecting should look something like this:
>
>Dest                    Gateway        Genmask        Flags    Metric    REF
>USE
>203.*.*.162        0.0.0.0     255.255.255.240    U        0            0
>0        eth0
>203.*.*.163        0.0.0.0     255.255.255.240    U        0            0
>0        eth1
>127.0.0.0            0.0.0.0     255.0.0.0                U        0
>0        0        lo
>0.0.0.0        203.*.*.161     0.0.0.0                    UG     0
>0        0        eth0
>
>when I hook up the bridge, 162 and 163 should dissapear and be replaced by:
>
>203.*.*.162        0.0.0.0     255.255.255.240    U        0            0
>0        br0
>
>OK, what I need help with is, where are the config files that would produce
>the broken routing table, or how do I fix it. I know RH 7.2 has specific
>files that set up the routing table in /etc/sysconfig, but RH 9 doesn't seem
>to have this file.
>
>    I have been stewing over this a week now and just CANNOT get it going. I
>have RTFMed all sorts of FMs, but still no joy. Your help would be greatly
>appreciated.
>    TIA,
>        Cheers!
>            Andrew
>
>
>
>
>_______________________________________________
>General mailing list
>General at lists.humbug.org.au
>http://lists.humbug.org.au/cgi-bin/mailman/listinfo/general
>
>  
>