Edgy: Eth0 not setting correct MTU
Sean Hammond
sean.hammond at gmail.com
Tue Oct 10 09:44:05 UTC 2006
That could be related to this bug:
https://launchpad.net/distros/ubuntu/+source/dhcp3/+bug/58927
for which there is a workaround
On 10/9/06, Richard <cms01 at tampabay.rr.com> wrote:
>
> > can you please post the whole ifconfig output?
> > What is in your /etc/network/interfaces
> >
> > it says your mtu is 576 right now. Maybe some hardware or cable issue?
> >
> > bye Thilo
>
> Okay, Thilo posting:
>
> sudo ifconfig -a
> $ sudo ifconfig -a
> eth0 Link encap:Ethernet HWaddr 00:03:25:28:93:B3
> inet addr:24.92.160.221 Bcast:255.255.255.255 Mask:255.255.248.0
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> RX packets:10913 errors:0 dropped:0 overruns:0 frame:0
> TX packets:713 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:1000
> RX bytes:1351985 (1.2 MiB) TX bytes:60616 (59.1 KiB)
> Interrupt:50
>
> eth1 Link encap:Ethernet HWaddr 00:14:A5:41:E4:99
> BROADCAST MULTICAST MTU:1500 Metric:1
> RX packets:0 errors:0 dropped:0 overruns:0 frame:0
> TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:1000
> RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
> Interrupt:11
>
> lo Link encap:Local Loopback
> inet addr:127.0.0.1 Mask:255.0.0.0
> inet6 addr: ::1/128 Scope:Host
> UP LOOPBACK RUNNING MTU:16436 Metric:1
> RX packets:0 errors:0 dropped:0 overruns:0 frame:0
> TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:0
> RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
>
> sit0 Link encap:IPv6-in-IPv4
> NOARP MTU:1480 Metric:1
> RX packets:0 errors:0 dropped:0 overruns:0 frame:0
> TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:0
> RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
>
> PLEASE note: I did Manual Change the MTU's (however when rebooting )
> it will go back to 576 !!
> ============================
>
> Here a dump from sudo lspci -vv
>
> 02:00.0 Ethernet controller: Marvell Technology Group Ltd. 88E8036 PCI-E Fast
> Ethernet Controller (rev 10)
> Subsystem: Gateway 2000 Unknown device 0506
> Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
> Stepping- SERR- FastB2B-
> Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort-
> <TAbort- <MAbort- >SERR- <PERR-
> Latency: 0, Cache Line Size: 32 bytes
> Interrupt: pin A routed to IRQ 58
> Region 0: Memory at c0100000 (64-bit, non-prefetchable) [size=16K]
> Region 2: I/O ports at a000 [size=256]
> Capabilities: [48] Power Management version 2
> Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA
> PME(D0+,D1+,D2+,D3hot+,D3cold+)
> Status: D0 PME-Enable- DSel=0 DScale=1 PME-
> Capabilities: [50] Vital Product Data
> Capabilities: [5c] Message Signalled Interrupts: 64bit+ Queue=0/1
> Enable+
> Address: 00000000fee00000 Data: 403a
> Capabilities: [e0] Express Legacy Endpoint IRQ 0
> Device: Supported: MaxPayload 128 bytes, PhantFunc 0, ExtTag-
> Device: Latency L0s unlimited, L1 unlimited
> Device: AtnBtn- AtnInd- PwrInd-
> Device: Errors: Correctable- Non-Fatal- Fatal- Unsupported-
> Device: RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop-
> Device: MaxPayload 128 bytes, MaxReadReq 512 bytes
> Link: Supported Speed 2.5Gb/s, Width x1, ASPM L0s, Port 3
> Link: Latency L0s <256ns, L1 unlimited
> Link: ASPM Disabled RCB 128 bytes CommClk- ExtSynch-
> Link: Speed 2.5Gb/s, Width x1
> Capabilities: [100] Advanced Error Reporting
> =========================================================
> Here a dump of the networking:
> Command 1 --no-devices --no-ip --no-arpcache --no-routes :
> ############################## Devices ##################################
> nu dev ethernet_hwtype mtu real_device_name
> 1 Lo0 loopback 16436 lo
> 2 Eth0 00:03:25:28:93:B3 1500 eth0
> 3 Eth1 00:14:A5:41:E4:99 1500 eth1
> 4 Unk0 unknown 1480 sit0
> ################################## IP ######################################
> nu ip /netmask ppp point_to_point_with
> 1 127.0.0.1 /255.0.0.0 0
> 1 ::1/128 0
> 2 24.92.160.221 /255.255.248.0 0
> ############################ ArpCache/Neighbor #############################
> nu ethernet ip
> 2 00:03:25:28:93:B3 24.92.160.221
> 2 00:05:9A:D7:88:71 24.92.160.1
> ################################## Routes###################################
> nu destination /netmask source gateway metric
> 1 127.0.0.1 /255.255.255.255 local 0
> 2 24.92.160.221 /255.255.255.255 local 0
> 2 24.92.160.0 /255.255.248.0 24.92.160.221 0
> 1 127.0.0.0 /255.0.0.0 127.0.0.1 0
> 2 0.0.0.0 /0.0.0.0 24.92.160.221 24.92.160.1 0
> 1 ::1/128 local 0
>
> =========
>
> Thanks -
> Oh, here a cup on me.
>
> ) ) )
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