[ILUG] Routing problem

[Kieran Murphy]

On Mon, Mar 2, 2009 at 9:31 AM, Kevin Philp <lists at cybercolloids.net> wrote:

> John Allen wrote:
>
>> Kevin wrote:
>>
>>> John Allen wrote:
>>>
>>>> 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.
>>>>>
>>>>>
>>>>  There does seem to be something wrong with it - the signal quality is
>>> claims to get from the access point is about 50% - which is weak considering
>>> the access point is about 15 feet away. Also it constantly backs off the
>>> rate from 54M down to 1M - my guess is either the wireless card or the
>>> router are decrepit - does that sound reasonable?
>>>
>>>  I've had a similar problem with my Laptop (Ubuntu Intrepid), was getting
>> 1M all the time until very recently, when some kernel update fixed it. Still
>> rarely get 54Mbps, but between 24 and 36.
>>
>> I'd direct wire the Deb box to the DSL modem/router (thats what I've
>> done), so at least the LAN is fast.
>>
>
> I had the box hard wired before and that was fine - but the family don't
> like ethernet cables run across hallways! I am surprised I got away with it
> as long as I did.
>
> I am looking into the driver issue.
>
> lspci tells me :
> 00:12.0 Network controller: RaLink RT2500 802.11g Cardbus/mini-PCI (rev 01)
>
> Actually its a rt2560F chip on an Edimax EW-7128g card
>
> lsmod tells me I have the following installed
>
> rt2500pci              17152  0
> rt2x00pci               7680  1 rt2500pci
> rt2x00lib              22272  2 rt2500pci,rt2x00pci
>
> My kernel is
> Linux server 2.6.26-1-486 #1 Sat Jan 10 17:46:23 UTC 2009 i586 GNU/Linux
>
> So it looks like we have the right driver running.
>
> I actually checked on a similar machine with a lan connection and I get the
> same "no reply" from tracepath - so I guess that's actually not telling me
> anything. I seem to have got it running stably at 2M - I will tweak it up
> slowly and see what happens.


Are you 100% Certain that your  Wireless connection is working?
You mention that you're using WPA. Perhaps your wpa_supplicant isn't doing
what its supposed to be doing.
Try testing this without WPA.

Regards,
Kieran..