Hi,
My server is running with 4 Gigabit NICs:
igb0@pci0:5:0:0: class=0x020000 card=0x152115d9 chip=0x15218086
rev=0x01 hdr=0x00
vendor = 'Intel Corporation'
device = 'I350 Gigabit Network Connection'
class = network
subclass = ethernet
igb1@pci0:5:0:1: class=0x020000 card=0x152115d9 chip=0x15218086
rev=0x01 hdr=0x00
vendor = 'Intel Corporation'
device = 'I350 Gigabit Network Connection'
class = network
subclass = ethernet
igb2@pci0:5:0:2: class=0x020000 card=0x152115d9 chip=0x15218086
rev=0x01 hdr=0x00
vendor = 'Intel Corporation'
device = 'I350 Gigabit Network Connection'
class = network
subclass = ethernet
igb3@pci0:5:0:3: class=0x020000 card=0x152115d9 chip=0x15218086
rev=0x01 hdr=0x00
vendor = 'Intel Corporation'
device = 'I350 Gigabit Network Connection'
class = network
subclass = ethernet
those NICs are connected to switch with LACP aggregation:
lagg0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
options=401bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,TSO4,VLAN_HWTSO>
ether 00:25:90:c1:1d:18
inet6 fe80::225:90ff:fec1:1d18%lagg0 prefixlen 64 scopeid 0x8
nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
media: Ethernet autoselect
status: active
laggproto lacp lagghash l2,l3,l4
laggport: igb3 flags=1c<ACTIVE,COLLECTING,DISTRIBUTING>
laggport: igb2 flags=1c<ACTIVE,COLLECTING,DISTRIBUTING>
laggport: igb1 flags=1c<ACTIVE,COLLECTING,DISTRIBUTING>
laggport: igb0 flags=1c<ACTIVE,COLLECTING,DISTRIBUTING>
Using this lagg interface I created 2 vlan interfaces:
vlan14: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
options=103<RXCSUM,TXCSUM,TSO4>
ether 00:25:90:c1:1d:18
inet 192.168.1.65 netmask 0xffffff00 broadcast 192.168.1.255
inet6 fe80::225:90ff:fec1:1d18%vlan14 prefixlen 64 scopeid 0x9
nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
media: Ethernet autoselect
status: active
vlan: 14 parent interface: lagg0
vlan900: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu
1500
options=103<RXCSUM,TXCSUM,TSO4>
ether 00:25:90:c1:1d:18
inet6 fe80::225:90ff:fec1:1d18%vlan900 prefixlen 64 scopeid 0xa
inet 172.25.25.65 netmask 0xffff0000 broadcast 172.25.255.255
nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
media: Ethernet autoselect
status: active
vlan: 900 parent interface: lagg0
I would like to increase the MTU on cards, but I can't set it in any way:
% sudo ifconfig igbX mtu 9000 [14:59:37]
ifconfig: ioctl (set mtu): Invalid argument
event setting the MTU to 1500 (default value) results in same error.
same for lagg0, and vlanX
How can I increase the MTU for lagg interface ?
Is it possible without rebooting or only via /etc/rc.conf ?
Regards,
--
Marek Salwerowicz
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