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List:       linux-kernel
Subject:    Default gateway is a Martian
From:       Pete Clements <clem () clem ! digital ! net>
Date:       1998-01-31 21:05:27
[Download RAW message or body]

This condition has existed since routing coded changed around 2.1.70...
With 2.1.84 get following when directly communicating with gateway

Jan 31 13:28:54 clem kernel: martian source e86845c6 for 49efd7cc, dev ppp0 
Jan 31 13:28:54 clem kernel: ll header: 45 00 02 14 

Packets are silently discarded, i.e. cannot ping ... rip packets dropped.
Only the gateway address is affected.
Pings to gateway address from internal machines is answered by
local end of link.

Configuration:
Have eight address subnet off ISP 
Local end IP 204.215.239.73, ISP end IP 198.69.104.232  via ppp (2.2.0f)

clem# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
204.215.239.72  0.0.0.0         255.255.255.248 U     0      0        0 eth0
198.69.104.232  0.0.0.0         255.255.255.248 U     0      0        0 ppp0
192.168.1.0     0.0.0.0         255.255.255.0   U     0      0        0 eth0
0.0.0.0         198.69.104.232  0.0.0.0         UG    0      0        0 ppp0

clem# iproute -c
Kernel routing cache
Destination     Source        TOS Gateway        Flg MTU    Ref Usage   HH Iface
132.163.135.130 204.215.239.73 00 198.69.104.232     1524   0   0       -1 ppp0
204.215.239.73  204.215.239.74 00 *              L   0      0   11      -1 lo
163.205.3.112   204.215.239.76 00 198.69.104.232 d   1524   0   26      -1 ppp0
163.205.3.112   204.215.239.74 00 198.69.104.232 d   1524   0   2       -1 ppp0
198.69.104.232  204.215.239.73 00 *              B   1524   0   6       -1 ppp0
163.205.3.112   204.215.239.74 10 198.69.104.232 d   1524   0   120     -1 ppp0
192.168.1.255   192.168.1.2    00 *              LBd 0      0   6       -1 lo
192.5.41.40     204.215.239.73 00 198.69.104.232     1524   0   0       -1 ppp0
204.215.239.73  198.41.0.4     00 *              L   0      0   0       -1 lo
204.215.239.73  192.33.4.12    00 *              L   0      0   0       -1 lo
204.215.239.74  204.215.239.73 00 *                  1500   0   8      *4  eth0
192.5.41.41     204.215.239.73 00 198.69.104.232     1524   0   0       -1 ppp0
192.168.1.255   192.168.1.1    00 *              LB  1500   0   16     *2  eth0
192.43.244.18   204.215.239.73 00 198.69.104.232     1524   0   2       -1 ppp0
204.215.239.73  192.5.41.41    00 *              L   0      0   3       -1 lo
204.215.239.73  192.5.41.40    00 *              L   0      0   3       -1 lo
204.215.239.74  163.205.3.112  00 *                  1500   0   106    *4  eth0
127.0.0.1       127.0.0.1      00 *              L   3584   0   3      *2  lo
204.215.239.73  132.163.135.130 00 *              L   0      0   3       -1 lo
192.33.4.12     204.215.239.73 00 198.69.104.232     1524   0   0       -1 ppp0
132.163.135.130 204.215.239.73 00 198.69.104.232     1524   0   2       -1 ppp0
192.168.1.1     192.168.1.2    00 *              L   0      0   5       -1 lo
192.168.1.2     192.168.1.1    00 *                  1500   0   4       2  eth0
204.215.239.73  192.43.244.18  00 *              L   0      0   2       -1 lo
198.41.0.4      204.215.239.73 00 198.69.104.232     1524   0   0       -1 ppp0
198.168.1.1     192.168.1.3    00 198.69.104.232 d   1524   0   5       -1 ppp0
198.69.104.232  204.215.239.74 00 *              LBd 0      0   5       -1 lo
192.43.244.18   204.215.239.73 00 198.69.104.232     1524   0   0       -1 ppp0
192.5.41.41     204.215.239.73 00 198.69.104.232     1524   0   2       -1 ppp0
127.0.0.1       127.0.0.1      00 *              L   3584   0   1       -1 lo
204.215.239.74  204.215.239.73 00 *                  1500   0   5      *4  eth0
192.5.41.40     204.215.239.73 00 198.69.104.232     1524   0   2       -1 ppp0
204.215.239.76  163.205.3.112  00 *                  1500   0   26      2  eth0

-- 
Pete Clements 
clem@clem.digital.net

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