Quick Routing Question

Steve Bertrand iaccounts at ibctech.ca
Tue Nov 1 07:25:34 PST 2005

> Destination        Gateway            Flags    Refs      Use  Netif 
> Expire
> default        UGS         0    24701    xl0
> 10/24              link#3             UC          0        0   fxp0
>           00:d0:b7:44:f9:c6  UHLW        0      903    lo0
>           00:50:8d:e5:a5:41  UHLW        0   322468  
>  fxp0    572
>           00:e0:98:04:01:f6  UHLW        0     1131  
>  fxp0   1140
>   link#2             UC          0        0    xl0
>      00:13:5f:00:f0:ee  UHLW        1        0  
>   xl0   1188
>      00:50:04:cf:52:8a  UHLW        0       18    lo0
>          UH          0        0    lo0
> 192.168.1          link#1             UC          0        0    dc0

Ok, this looks ok. The 10/24 network *should* be able to see/route
anything back and forth to the 192.168.1/24 network without difficulty.

Now, I can't remember if you said how this was cabled, but this is how I
set up my wifi networks:

- plug the wireless network interface in the FBSD router into one of the
LAN switch ports on the wireless AP/router (if indeed it is a router).
The IP address on the LAN side of the AP is irrelevant, so long as you
don't conflict with another IP. 
- Give the wireless laptop a static IP inside the wireless IP subnet
- Have nothing plugged into the WAN side of the wireless AP, as you
don't want routing with that unit, you just want a layer-2
(bridged/switched) AP.
- effectively, if you have wireless connectivity from the laptop to the
AP, you should be able to ping the FW, and vice-versa

If it doesn't work, cable up the laptop to the LAN side of the AP,
ensuring it has a proper IP in the wifi range, and then ping.

If all else fails, set up a round of say 100 pings from the laptop to
the FBSD box, and on the FBSD box, do this:

# tcpdump -n -i fxp0

where fxp0 is the interface the AP is plugged into. This will show you
first, if the pings are getting from the wifi subnet to the FBSD box,
and also if they are being returned. Inbound pings but no outbound pings
could indicate a deeper routing issue or FW issue. No inbound pings
could indicate a problem with IP allocation or subnet issues.

tcpdump (1) is a great tool, and may even help further troubleshoot the

If you can ping from wifi to FBSD wifi interface, then push the scope of
the test further, trying to ping the cabled side of the FBSD box.

let us know what you find, as the more detail we have after certain
tests, will enable us to provide further recommendations. Also, an
ifconfig output could help too, so long everything is all connected.



> Internet6:
> Destination                       Gateway              Flags 
> Netif Expire
> ::1                               ::1                  UH     lo0
> fe80::%dc0/64                     link#1               UC     dc0
> fe80::204:5aff:fe42:5084%dc0      00:04:5a:42:50:84    UHL    lo0
> fe80::%xl0/64                     link#2               UC     xl0
> fe80::250:4ff:fecf:528a%xl0       00:50:04:cf:52:8a    UHL    lo0
> fe80::%fxp0/64                    link#3               UC     fxp0
> fe80::2d0:b7ff:fe44:f9c6%fxp0     00:d0:b7:44:f9:c6    UHL    lo0
> fe80::%lo0/64                     fe80::1%lo0          U      lo0
> fe80::1%lo0                       link#4               UHL    lo0
> ff01::/32                         ::1                  U      lo0
> ff02::%dc0/32                     link#1               UC     dc0
> ff02::%xl0/32                     link#2               UC     xl0
> ff02::%fxp0/32                    link#3               UC     fxp0
> ff02::%lo0/32                     ::1                  UC     lo0
> Also, made one small error in my initial post.  The wireless 
> router has IP and the server's 'wireless' 
> interface is (going to switch these as soon as I 
> get access to the wireless router settings).
> I've tried setting static routes between various interfaces 
> on the FreeBSD machine, it hasn't worked, but I may be doing 
> it wrong. I thought routed should take care of this 
> dynamically, but I'm a bit unsure about that.
> > 
> > Steve
> > 
> > > 
> > > Fabian
> > > --
> > > http://www.fabiankeil.de/
> > > 
> > 
> Thanks alot for the replies. I appreciate it.
> Jason
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