(revised) 4.0-stable & Linksys WRT54G won't talk w/each other

[Anthony Volodkin]

Hey,

Apparently the WRT54G is having some arp issues.  I'd check the following:

- install latest firmware

- install Ethereal on the windows machine and watch the traffic exchange
when you would ping/access the WRT54G.  It is important that this is done
right after boot so that the Windows machine does not have the MAC of
WRT54G cached.  It'd be interesting to compare the arp requests from the
FreeBSD machine to ones from the Win2k one, if that seems at all
different.

- Finally, I assumed that the cable that you are using to connect the
freebsd box to WRT54G is just as good as the one you use with the Windows
machine.

-Anthony

On Fri, 9 Jan 2004, Kenneth W Cochran wrote:

> 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
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