[ILUG] Routing problem

[Kevin Philp]

Kieran Murphy wrote:
>
>
> On Mon, Mar 2, 2009 at 9:31 AM, Kevin Philp <lists at cybercolloids.net 
> <mailto: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
>                     <http://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..
>
100% sure - the only route to the internet is via the wireless nic on 
the router box - the lan cable has been removed - the hallway is clear. 
It does work - I can browse the internet, run aptitude update - but the 
connection is just slow. I had a similar problem a while back when one 
of the telephone filters was removed and connection speeds dropped by 
about 10 fold.

I ran a test downloading a large file from heanet. On my Eircom 
connection at work I got full speed ~270k at home it levelled out at 70k 
- so I have a connection, its just poor. That was the same file from the 
same server downloaded just a few minutes apart.

I have actually just read an article on cordless phones causing problems 
- and we have just got some new cordless phones!! I will report back on 
what I find.


Kevin.