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Message #03684
[Bug 1324214] Re: NetworkManager sets MTU to 9000 even on 100mbps connections
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: network-manager (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1324214
Title:
NetworkManager sets MTU to 9000 even on 100mbps connections
Status in “network-manager” package in Ubuntu:
Confirmed
Bug description:
I have a network which supports jumbo frames end-to-end internally.
This weekend, after rebooting my laptop, it came up only negotiating
100mbps, but networkManager still set the MTU to 9000, which doesn't
work (can't do jumbo frames on anything except 1gbps, by spec). NM
should recognie the auto-negotiated rate as part of the "automatic
MTU" determiniation.
Kubuntu 14.04. When I pulled the cable, and rerouted it, the laptop
re-negotiated 1gbps again, and jumbo frames went fine. This output
was gathered during the time when the laptop was stuck at 100mbps.
rob@kubuntu4:~$ lsb_release -rd
Description: Ubuntu 14.04 LTS
Release: 14.04
rob@kubuntu4:~$ sudo apt-cache policy network-manager
[sudo] password for rob:
network-manager:
Installed: 0.9.8.8-0ubuntu7
Candidate: 0.9.8.8-0ubuntu7
Version table:
*** 0.9.8.8-0ubuntu7 0
500 http://us.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
100 /var/lib/dpkg/status
Network setup is:
kubuntu laptop -> dlink switch -> ESXi 5.1 server -> VMs
MTU=9000 causes problems.
VM -> VM works on same server.
Switch hardware: http://www.dlink.com/us/en/business-solutions/switching/unmanaged-switches/rackmount/dgs-1024d-24-port-copper-gigabit-switch
ESX set up following: http://www.edge-cloud.net/2013/11/jumbo-frames-vmware-esxi/
TCP packets over 1500 bytes just keep getting retransmitted, accordint to tcpdump captures.
Laptop:
rob@kubuntu4:/var/log$ sudo ethtool eth0
[sudo] password for rob:
Settings for eth0:
Supported ports: [ TP ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Supported pause frame use: No
Supports auto-negotiation: Yes
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Advertised pause frame use: No
Advertised auto-negotiation: Yes
Speed: 100Mb/s
Duplex: Full
Port: Twisted Pair
PHYAD: 2
Transceiver: internal
Auto-negotiation: on
MDI-X: off (auto)
Supports Wake-on: pumbg
Wake-on: g
Current message level: 0x00000007 (7)
drv probe link
Link detected: yes
rob@kubuntu4:/var/log$ ifconfig eth0
eth0 Link encap:Ethernet HWaddr 00:21:cc:cf:e0:78
inet addr:192.168.0.106 Bcast:192.168.0.255 Mask:255.255.255.0
inet6 addr: fe80::221:ccff:fecf:e078/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:9000 Metric:1
RX packets:17744 errors:0 dropped:0 overruns:0 frame:0
TX packets:15941 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:11750951 (11.7 MB) TX bytes:5220060 (5.2 MB)
Interrupt:20 Memory:d2500000-d2520000
VM SSH Server:
rob@srv1:/var/log$ sudo ethtool eth0 [8/1084]
[sudo] password for rob:
Settings for eth0:
Supported ports: [ TP ]
Supported link modes: 1000baseT/Full
10000baseT/Full
Supported pause frame use: No
Supports auto-negotiation: No
Advertised link modes: Not reported
Advertised pause frame use: No
Advertised auto-negotiation: No
Speed: 10000Mb/s
Duplex: Full
Port: Twisted Pair
PHYAD: 0
Transceiver: internal
Auto-negotiation: off
MDI-X: Unknown
Supports Wake-on: uag
Wake-on: d
Link detected: yes
rob@srv1:/var/log$ ifconfig eth0
eth0 Link encap:Ethernet HWaddr 00:50:56:B6:7F:3D
inet addr:192.168.0.21 Bcast:192.168.0.255 Mask:255.255.255.0
inet6 addr: fe80::250:56ff:feb6:7f3d/64 Scope:Link
UP BROADCAST RUNNING ALLMULTI MULTICAST MTU:9000 Metric:1
RX packets:22817347 errors:0 dropped:80 overruns:0 frame:0
TX packets:11956945 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:11504454844 (10.7 GiB) TX bytes:32510875048 (30.2 GiB)
ESX Server:
This system has been migrated to ESXi 5.1.0.
~ # esxcfg-vswitch -l
Switch Name Num Ports Used Ports Configured Ports MTU Uplinks
vSwitch0 128 24 128 9000 vmnic0,vmnic1
PortGroup Name VLAN ID Used Ports Uplinks
Management Network 0 1 vmnic0,vmnic1
VM Network 0 17 vmnic0,vmnic1
VMkernel 0 1 vmnic0,vmnic1
~ # esxcfg-vmknic -l
Interface Port Group/DVPort IP Family IP Address Netmask Broadcast MAC Address MTU TSO MSS Enabled Type
vmk0 VMkernel IPv4 192.168.0.251 255.255.255.0 192.168.0.255 00:50:56:71:b6:3a 9000 65535 true STATIC
vmk1 Management Network IPv4 192.168.0.250 255.255.255.0 192.168.0.255 00:50:56:47:fc:b9 9000 65535 true STATIC
~ # esxcfg-nics -l
Name PCI Driver Link Speed Duplex MAC Address MTU Description
vmnic0 0000:03:00.00 bnx2 Up 1000Mbps Full 00:1e:4f:1f:fa:6c 9000 Broadcom Corporation Broadcom NetXtreme II BCM5708 1000Base-T
vmnic1 0000:07:00.00 bnx2 Up 1000Mbps Full 00:1e:4f:1f:fa:6e 9000 Broadcom Corporation Broadcom NetXtreme II BCM5708 1000Base-T
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