routes disappear

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I've been having an intermittent problem over the last couple of years where the addition of a network interface will cause all routes on the box to vanish.
the systems are a stripped down Debian 3.0 build with a 2.6.7 kernel and the vast majority of the time they work just fine.
however once in a while I get a config where enabling an interface causes netstat (and /proc/net/route) to report no routes. The system continues to function so the routes are still there somehow, but they aren't reported.
the latest box to do this has two interfaces (this one has tg3 interfaces, but I've also seen this on adaptec starfire, tulip, and 3com nics) 192.168.242.142 
192.168.210.219
if I boot the box with the interfaces disabled and do ifup individually it sometimes works (I haven't nailed down the difference between when it does and when it doesn't), if I leave them enabled at boot by the time I can login the routing table shows blank.
I have a few days to fiddle with this system before I need to use it, where should I look to dig up more info? 

syslog shows the following
Aug 16 16:33:04 scribe1a-p kernel: Adding 2048276k swap on /dev/sda1. Priority:-1 extents:1 
Aug 16 16:33:04 scribe1a-p kernel: ttyS2: LSR safety check engaged!
Aug 16 16:33:04 scribe1a-p kernel: ttyS2: LSR safety check engaged!
Aug 16 16:33:04 scribe1a-p kernel: ttyS3: LSR safety check engaged!
Aug 16 16:33:04 scribe1a-p kernel: ttyS3: LSR safety check engaged!
Aug 16 16:33:04 scribe1a-p kernel: tg3: eth0: Link is up at 1000 Mbps, full duplex. Aug 16 16:33:04 scribe1a-p kernel: tg3: eth0: Flow control is on for TX and on for RX. Aug 16 16:33:04 scribe1a-p kernel: tg3: eth1: Link is up at 1000 Mbps, full duplex. Aug 16 16:33:04 scribe1a-p kernel: tg3: eth1: Flow control is off for TX and off for RX. Aug 16 16:33:04 scribe1a-p kernel: process `syslogd' is using obsolete setsockopt SO_BSDCOMPAT Aug 16 16:33:05 scribe1a-p /usr/sbin/gpm[191]: Detected EXPS/2 protocol mouse. Aug 16 16:33:07 scribe1a-p ntpd[298]: ntpd 4.1.0 Mon Mar 25 23:39:47 UTC 2002 (2) 
Aug 16 16:33:07 scribe1a-p ntpd[298]: precision = 11 usec
Aug 16 16:33:07 scribe1a-p ntpd[298]: kernel time discipline status 0040
Aug 16 16:33:07 scribe1a-p ntpd[298]: attempt to configure invalid address 127.127.1.0 Aug 16 16:33:07 scribe1a-p /usr/sbin/cron[303]: (CRON) INFO (pidfile fd = 3) 
Aug 16 16:33:07 scribe1a-p /usr/sbin/cron[304]: (CRON) STARTUP (fork ok)
Aug 16 16:33:07 scribe1a-p /usr/sbin/cron[304]: (CRON) INFO (Running @reboot jobs) Aug 16 16:33:16 scribe1a-p ntpd[298]: sendto(192.168.252.132): Network is unreachable Aug 16 16:33:23 scribe1a-p ntpd[298]: sendto(192.168.252.131): Network is unreachable Aug 16 16:33:36 scribe1a-p kernel: 192.168.242.142 sent an invalid ICMP type 3, code 1 error to a broadcast: 192.168. 
242.255 on lo
Aug 16 16:33:36 scribe1a-p kernel: 192.168.242.142 sent an invalid ICMP type 3, code 1 error to a broadcast: 192.168. 
242.255 on lo
Aug 16 16:33:39 scribe1a-p kernel: tg3: eth0: Link is up at 1000 Mbps, full duplex. Aug 16 16:33:39 scribe1a-p kernel: tg3: eth0: Flow control is on for TX and on for RX. Aug 16 16:33:42 scribe1a-p kernel: 192.168.210.216 sent an invalid ICMP type 3, code 1 error to a broadcast: 192.168. 
210.255 on lo
Aug 16 16:33:42 scribe1a-p kernel: 192.168.210.216 sent an invalid ICMP type 3, code 1 error to a broadcast: 192.168. 
210.255 on lo
Aug 16 16:33:43 scribe1a-p kernel: tg3: eth1: Link is up at 1000 Mbps, full duplex. Aug 16 16:33:43 scribe1a-p kernel: tg3: eth1: Flow control is off for TX and off for RX. Aug 16 16:33:55 scribe1a-p kernel: tg3: eth1: Link is up at 1000 Mbps, full duplex. Aug 16 16:33:55 scribe1a-p kernel: tg3: eth1: Flow control is off for TX and off for RX. Aug 16 16:34:01 scribe1a-p /USR/SBIN/CRON[716]: (root) CMD (touch /tmp/.crond_running >/dev/null 2>/dev/null) Aug 16 16:34:02 scribe1a-p kernel: 192.168.242.142 sent an invalid ICMP type 3, code 1 error to a broadcast: 192.168. 
242.255 on lo
Aug 16 16:34:02 scribe1a-p kernel: 192.168.242.142 sent an invalid ICMP type 3, code 1 error to a broadcast: 192.168. 
242.255 on lo
Aug 16 16:34:04 scribe1a-p kernel: tg3: eth0: Link is up at 1000 Mbps, full duplex. Aug 16 16:34:04 scribe1a-p kernel: tg3: eth0: Flow control is on for TX and on for RX. Aug 16 16:35:01 scribe1a-p /USR/SBIN/CRON[1126]: (root) CMD (/usr/local/etc/newlogs >/dev/null 2>/dev/null) Aug 16 16:35:01 scribe1a-p /USR/SBIN/CRON[1128]: (root) CMD (touch /tmp/.crond_running >/dev/null 2>/dev/null) 


David Lang


--
There are two ways of constructing a software design. One way is to make it so simple that there are obviously no deficiencies. And the other way is to make it so complicated that there are no obvious deficiencies.
 -- C.A.R. Hoare
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