[xubuntu-users] ethernet oddity

[Michael Surette]

 It  looks  to  me  as  if  your gigabit ethernet only supports 
gigabit speed.  If it supported slower speeds they should be listed in 
your ethtool output.

The solution would therefore be to either add a network card or upgrade 
your router.

Mike 
> ----- Original Message -----
> From: Sandy Harris
> Sent: 09:53 am
> To: xubuntu-users at lists.ubuntu.com
> Subject: [xubuntu-users] ethernet oddity
> 
> I have two machines, recently installed Xubutu on both.
> One Ethernet works and the other does not.
> 
> Both use static IPs, 172.31.255.[12], they talk to the
> same router, and switching cables or router ports does
> not help. Xubuntu on both is 7.10 Gutsy.
> 
> I used 1386 on both even though one is AMD, because
> one will be an xterm to the other and it seemed easier
> to just have one archtecture. The AMD is working, and
> the INtel-based machine not, though, so architcture is
> not the problem.
> 
> Working machine has an AMD CPU and onboard 10/100
> network that uses Sundance driver.
> 
> One with problems is Core 2 duo on a Gigabyte board,
> model #GA-G31M-S2L. GIgabyte docs say the gigabit
> ethernet uses Realtek R8111B chip, and lspci says
> 8111/8168B, but the driver that is loading is R8169.
> Could that be the problem?
> 
> pinging its own address, 172...2 works, but not the
> router at .254 or other machine at .1. Router does
> respond to pings from the other machine.
> 
> route -n gives results that look correct:
> Destination      Gateway              Mask                 Flags       
> Iface
> 172.31.255.0   0.0.0.0                 255.255.255.0   U            eth0
> 0.0.0.0             172.31.255.254    0.0.0.0              UG          
> eth0
> 
> (except there's another line for 169.254.0.0; how do I get rid of it?)
> 
> ifconfig eth0 looks OK too
> inet addr: 172.31.255.2   Bcast: 172.31.255.255  Mask: 255.255.255.0
> 
> ethtool gives some results that look odd:
>     Supported ports: [FIBRE]
>     Supported link modes: 1000baseT/FULL
>     Supports auto-negotiation: yes
>     Speed: 1000 Mbps
>     Auto-negotiation: on
>     Link detected: yes
> 
> Since the router is 10/100, this appears to be the wrong speed.
> "ethtool -s eth0 speed 100" gives no error messages, but does
> not solve the problem.
> 
> I tried "modprobe -r r8169" and then "modprobe r8169" to
> re-insert it. After that, lsmod says it is there, but both ethtool
> and ifconfig give "no such device"messages for eth0.
> 
> Not sure what to try next or how to diagnose the problem.
> 
> -- 
> Sandy Harris,
> Nanjing, China
> 
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