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Network : veth pair : fix mtu

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The ip link set command which create the veth pair is not setting mtu on both peers

example:
vm 106 is on a bridge with mtu 9000

222: tap160i1: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 9000 qdisc pfifo_fast master fwbr160i1 state UNKNOWN group default qlen 1000
223: fwbr160i1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
224: fwpr160p1@fwln160i1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9000 qdisc noqueue state UP group default qlen 1000
225: fwln160i1@fwpr160p1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000

fwpr160p1@fwln160i1 is correctly created with mtu 9000
but
fwln160i1@fwpr160p1 is created with mtu 1500.
(and then vmbr106i1 is lowered to 1500 too).

This is doing network problem, as tap160i1 is mtu9000.

After this patch:

222: tap160i1: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 9000 qdisc pfifo_fast master fwbr160i1 state UNKNOWN group default qlen 1000
223: fwbr160i1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9000 qdisc noqueue state UP group default qlen 1000
224: fwpr160p1@fwln160i1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9000 qdisc noqueue state UP group default qlen 1000
225: fwln160i1@fwpr160p1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9000 qdisc noqueue state UP group default qlen 1000
This commit is contained in:
Alexandre Derumier 2018-11-21 17:34:29 +01:00 committed by Wolfgang Bumiller
parent 0a3de87e0f
commit d6a2cdcb76
1 changed files with 1 additions and 1 deletions
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2
src/PVE/Network.pm
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@ -291,7 +291,7 @@ sub veth_create {
# create veth pair
if (! -d "/sys/class/net/$veth") {
my $cmd = "/sbin/ip link add name $veth type veth peer name $vethpeer mtu $bridgemtu";
my $cmd = "/sbin/ip link add name $veth mtu $bridgemtu type veth peer name $vethpeer mtu $bridgemtu";
$cmd .= " addr $mac" if $mac;
system($cmd) == 0 || die "can't create interface $veth\n";
}