Hi,
When setting CARP over VLAN configured interfaces, the MTU value of the
CARP interface reflects that of the physical interface, not the VLAN
interface. Should it not be indicative of the MTU available on the VLAN
interface (4 less than the physical interface) since it is to the CARP
interface that the data is ultimately directed?
System: FreeBSD 5.4-p8 with CARP device compiled in.
Interface vxn1 is the physical interface on which two vlans (vlan0 and
vlan1) are configured. Two CARP interfaces (carp0 and carp1) are added,
one for each vlan.
As seen below, the MTU for the physical interface is 1500, and the VLAN
interfaces 1496, but the CARP interfaces are showing 1500.
vxn0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
inet6 fe80::20c:29ff:fef1:9f42%vxn0 prefixlen 64 scopeid 0x1
inet 10.1.1.1 netmask 0xffffff00 broadcast 10.1.1.255
ether 00:0c:29:f1:9f:42
vxn1: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu
1500
inet6 fe80::20c:29ff:fef1:9f4c%vxn1 prefixlen 64 scopeid 0x2
ether 00:0c:29:f1:9f:4c
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384
inet 127.0.0.1 netmask 0xff000000
inet6 ::1 prefixlen 128
inet6 fe80::1%lo0 prefixlen 64 scopeid 0x5
vlan0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu
1496
inet 10.10.10.11 netmask 0xffffff00 broadcast 10.10.10.255
inet6 fe80::20c:29ff:fef1:9f42%vlan0 prefixlen 64 scopeid 0x6
ether 00:0c:29:f1:9f:4c
vlan: 10 parent interface: vxn1
vlan1: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu
1496
inet 10.10.20.11 netmask 0xffffff00 broadcast 10.10.20.255
inet6 fe80::20c:29ff:fef1:9f42%vlan1 prefixlen 64 scopeid 0x7
ether 00:0c:29:f1:9f:4c
vlan: 20 parent interface: vxn1
carp0: flags=41<UP,RUNNING> mtu 1500
inet 10.10.10.10 netmask 0xffffff00
carp: MASTER vhid 1 advbase 1 advskew 0
carp1: flags=41<UP,RUNNING> mtu 1500
inet 10.10.20.10 netmask 0xffffff00
carp: MASTER vhid 1 advbase 1 advskew 0
Andrew
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