[ILUG] Routing problem

[John Allen]

Kevin wrote:
> I am having problems with my Debian/Lenny firewall/routing box. The 
> internet connection runs really, really slow. It does work - but its 
> very slow.
>
> My internal lan is 192.168.100.*
> My DSL router is 192.168.1.254
> My external nic (wireless) is 192.168.1.1
> My internal nic is 192.168.100.1
>
> I checked the routing table:
>
> Kernel IP routing table
> Destination     Gateway         Genmask         Flags Metric Ref    
> Use Iface
> 192.168.100.0   *               255.255.255.0   U     0      0        
> 0 eth0
> 192.168.1.0     *               255.255.255.0   U     0      0        
> 0 wlan0
> default         192.168.1.254   0.0.0.0         UG    0      0        
> 0 wlan0
>
Your default route is the wireless connection, I'd guess the wireless 
connection is the issue.
>
> Ifconfig/iwconfig look OK. However if I run traceroute I get some odd 
> results:
>
> traceroute to an internal LAN address completes in 1 hop
>
> traceroute to the DSL router 192.168.1.254 from the firewall box fails 
> after about 30 hops - it should be 1 hop.
>
> Running tracepath on the DSL box gives me:
>
> server:/home/kevinphilp# tracepath 192.168.1.254
> 1:  192.168.1.1 (192.168.1.1)                              1.218ms 
> pmtu 1500
> 1:  no reply
> 2:  no reply
>
> On google I get the same
> server:/home/kevinphilp# tracepath www.google.com
> 1:  192.168.1.1 (192.168.1.1)                              0.950ms 
> pmtu 1500
> 1:  no reply
> 2:  no reply
>
> Any thoughts welcome
>
> Kevin.
>