Can't talk to router--broken routing table? (MDK10)

Entropius · 06-22-2004, 07:52 PM

OK, I feel like an idiot.

I'm trying to get internet connection sharing set up using a dialup connection and a wireless router, using a Mandrake 10 box as the machine with the modem.

In trying to get this to work, somehow I've rendered the machine unable to talk to the wireless AP/router... I think I've somehow hosed the routing table.

The router lives at 192.168.0.254. It's alive--my other machines can talk to it.

However, attempting to poke it with this machine gives the following mess:

[root@localhost etc]# ping 192.168.0.254
PING 192.168.0.254 (192.168.0.254) 56(84) bytes of data.
From 192.168.0.100 icmp_seq=1 Destination Host Unreachable
From 192.168.0.100 icmp_seq=1 Destination Host Unreachable
From 192.168.0.100 icmp_seq=1 Destination Host Unreachable
From 192.168.0.100 icmp_seq=1 Destination Host Unreachable
From 192.168.0.100 icmp_seq=1 Destination Host Unreachable
From 192.168.0.100 icmp_seq=1 Destination Host Unreachable
ping: sendmsg: Operation not permitted
From 192.168.0.100 icmp_seq=2 Destination Host Unreachable
ping: sendmsg: Operation not permitted
From 192.168.0.100 icmp_seq=3 Destination Host Unreachable
ping: sendmsg: Operation not permitted

... and so forth.

Route says the following:

Code:

[root@localhost etc]# route
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
168.121.1.1     *               255.255.255.255 UH    0      0        0 ppp0
192.168.0.0     *               255.255.255.0   U     0      0        0 eth0
127.0.0.0       *               255.0.0.0       U     0      0        0 lo
default         192.168.0.254   0.0.0.0         UG    0      0        0 eth0
default         168.121.1.1     0.0.0.0         UG    0      0        0 ppp0

And, finally:

Code:

[root@localhost etc]# ifconfig eth0

eth0      Link encap:Ethernet  HWaddr 00:10:B5:0E:E2:6C
          inet addr:192.168.0.100  Bcast:192.168.0.255  Mask:255.255.255.0
          inet6 addr: fe80::210:b5ff:fe0e:e26c/64 Scope:Link
          UP BROADCAST NOTRAILERS RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:68 errors:0 dropped:0 overruns:0 frame:0
          TX packets:83 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:11267 (11.0 Kb)  TX bytes:9643 (9.4 Kb)
          Interrupt:11 Base address:0x6000

Any clue what could be the matter, or how I can get my machine to talk to my router again?

foo_bar_foo · 06-22-2004, 10:33 PM

i hope i get this somewhat right (please be aware i'm an idiot)
im assuming that these two entries come up when you modem up
168.121.1.1 * 255.255.255.255 UH 0 0 0 ppp0
default 168.121.1.1 0.0.0.0 UG 0 0 0 ppp0

they are correct

however this one
default 192.168.0.254 0.0.0.0 UG 0 0 0 eth0
i think should not be there
i think this is telling that the wireless router is the default gateway to the www (WAN)
when really it is the access to the local LAN
this is correct
192.168.0.0 * 255.255.255.0 U 0 0 0 eth0
and should suffice for that
try when the moden is not connected:

route del default
possibly
route del default gw dev eth0
(i'm not so sure about the command but i bet the first one works)

and see if that fixes
if so then just find the file where that GATEWAY is being set at boot and remove that entry

Entropius · 06-23-2004, 09:23 AM

I came to the same conclusion, and tried to delete those two lines

Code:

192.168.0.0     192.168.0.100   255.255.255.0   UG    0      0        0 eth0
192.168.0.0     *               255.255.255.0   U     0      0        0 eth0

Using route del default removes the entry

Code:

default         168.121.1.1     0.0.0.0         UG    0      0        0 ppp0

which is a bad thing--it's the route to the internet. The other command doesn't work.

I tried doing ...

Code:

[root@localhost ifplugd]# route del 192.168.0.0
SIOCDELRT: No such process

... but it won't let me remove that entry.

What files do I look in (yeah, I'm dumb) to find the startup script that initializes those erroneous routes?

foo_bar_foo · 06-23-2004, 11:45 AM

I don't use prepackaged distros anymore
and have never looked at mandrake
so sometimes i'm suprised at where this stuff is
should be somewhere in
/etc/sysconfig/
file should be called ifconfig.eth0 or ifcfg-eth0 or something to that effect
on my system it's in /etc/sysconfig/network-devices
on my fedora c1 installation its in
/etc/sysconfig/networking/profiles/default
should be a line in there
GATEWAY=