(revised) 4.*9*-stable & Linksys WRT54G won't talk w/each other

[Kenneth W Cochran]

oops, mistype, that should've been 4.9-stable instead of 4.0...
stupidfingers...

Hello:

I'm having problems getting a FreeBSD machine and a Linksys
WRT54G talking with each other.

Interfaces:
dc0 - "public" to outside Internet
dc1 - internal 192.168.0.1/24, connects to a hub
dc2 - internal 192.168.1.100/24, connects to a switched LAN port on the router
dc3 - currently unused

OS: FreeBSD 4.9-STABLE as of 10 December 2003
firewall: ipfw2
Running natd between dc0 & dc1 (& that works fine)

dc0 gets its IP address, etc., via DHCP/dhclient.
dc1 is configured statically & machines connected on that subnet work fine.
dc2 should get its ip address, etc. from a Linksys WRT54G,
    but won't; syslog says "address in use," so I configured it "manually"
    with ifconfig, to 192.168.1.100/24.

Problems/questions:

dc2 has a Linksys WRT54G on it, & thus far, that box refuses
to talk (not even icmp) with the fbsd machine, even if I set
its ip-address & that of dc2 manually.  (The Linksys
defaults to running a dhcp server & its factory-supplied
ip-address is 192.168.1.1 & it "tries" to setup the first
interface talking to it to be 192.168.1.100).  The router
works fine when connecting another machine (running Windows
2000) to it.

As examples:
$ ping -c3 192.168.0.2  ## this is a Windows2000 box on the dc1 network
PING 192.168.0.2 (192.168.0.2): 56 data bytes
64 bytes from 192.168.0.2: icmp_seq=0 ttl=128 time=0.391 ms
64 bytes from 192.168.0.2: icmp_seq=1 ttl=128 time=0.177 ms
64 bytes from 192.168.0.2: icmp_seq=2 ttl=128 time=0.232 ms

--- 192.168.0.2 ping statistics ---
3 packets transmitted, 3 packets received, 0% packet loss
round-trip min/avg/max/stddev = 0.177/0.267/0.391/0.091 ms

localhost# tcpdump -lni dc1  ## tcpdump while running the above ping
tcpdump: listening on dc1
10:15:39.882162 arp who-has 192.168.0.2 tell 192.168.0.1
10:15:39.882305 arp reply 192.168.0.2 is-at 0:90:27:84:42:f
10:15:39.882318 192.168.0.1 > 192.168.0.2: icmp: echo request
10:15:39.882492 192.168.0.2 > 192.168.0.1: icmp: echo reply
10:15:40.883394 192.168.0.1 > 192.168.0.2: icmp: echo request
10:15:40.883511 192.168.0.2 > 192.168.0.1: icmp: echo reply
10:15:41.893417 192.168.0.1 > 192.168.0.2: icmp: echo request
10:15:41.893584 192.168.0.2 > 192.168.0.1: icmp: echo reply

$ ping -c3 192.168.1.1  ## ip address of the router on dc2
PING 192.168.1.1 (192.168.1.1): 56 data bytes

--- 192.168.1.1 ping statistics ---
3 packets transmitted, 0 packets received, 100% packet loss

localhost# tcpdump -lni dc2  ## tcpdump while running the above ping
tcpdump: listening on dc2
10:17:18.123385 arp who-has 192.168.1.1 tell 192.168.1.100
10:17:19.124588 arp who-has 192.168.1.1 tell 192.168.1.100
10:17:20.134583 arp who-has 192.168.1.1 tell 192.168.1.100

Any ideas on getting this thing to work?  It seems to work
fine when connected to a Windows2000 machine.
Yes, I've tried other interfaces & cables, etc, so I'm
confident the hardware is fine. :)

Idea(s) on further troubleshooting/fixing this?

FAQs/documentation pointers are quite welcome. :)

Thanks,

-kc