[PLUG] Bizarre network problem

Bill Barry bill at billbarry.org
Wed Sep 5 14:06:16 UTC 2007


On 9/5/07, Fedor Pikus <fpikus at gmail.com> wrote:
>
> I ran into a very strange network problem. I was setting up a wireless
> bridge (I don't think the "wireless" part is important), so there is
> what I have:
>
> Wireless bridge - 192.168.1.37
> Bridge is connected to a switch, into the switch I plug these:
> PC - 192.168.1.16
> Tivo - 192.168.1.25
> Laptop - 192.168.1.241
>
> >From the laptop, I can ping PC, Tivo, and the bridge, so everything on
> the wired part is connected.
> >From the PC, I can ping laptop and Tivo but not bridge. The difference
> seems to be in arp requests. When I ping bridge from laptop, tcpdump
> shows this:
>
> arp who-has 192.168.1.37 tell 192.168.1.241
> arp reply 192.168.1.37 is-at 00:18:02:74:94:35
>
> When I ping bridge from PC, tcpdump shows repeated who-has line but
> the reply never comes.
>
> They are all connected into the same switch (wired), they are all on
> the same net, they use the same network and mask
> 192.168.0.0/255.255.0.0, why one works and one doesn't?
>
>
Maybe there is something wrong with the switch between the bridge and the pc
so the bridge is not getting the arp who-has. Try moving things around on
the switch.

Bill Barry



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