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authorChristian Breunig <christian@breunig.cc>2023-11-22 10:52:40 +0100
committerMergify <37929162+mergify[bot]@users.noreply.github.com>2023-11-22 10:05:48 +0000
commitb083d60102e5b955a7dda544e94bc92b21e619b6 (patch)
tree273700d2e54964f089fa86e4b5b108f67e119683 /smoketest/scripts/cli/test_ha_vrrp.py
parentb1ef7ba3e5f66d446cd83609b25e05ab47f92060 (diff)
downloadvyos-1x-b083d60102e5b955a7dda544e94bc92b21e619b6.tar.gz
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vxlan: T5759: change default MTU from 1450 -> 1500 bytes
Found an odd behavior on Linux and the VyOS CLI implementation. If adding VXLAN interfaces using iproute2 the MTU differs depending on the creation syntax: ip -4 link add vxlan100 type vxlan dstport 4789 external df unset tos inherit \ ttl 16 nolearning vnifilter local 172.16.33.201 ip -4 link add vxlan200 type vxlan id 200 dstport 4789 local 172.16.33.201 dev eth0 ip -6 link add vxlan300 type vxlan id 300 dstport 4789 local 2001:db8:1::1 dev eth0 132: vxlan300: <BROADCAST,MULTICAST> mtu 1430 qdisc noop state DOWN group default qlen 1000 link/ether 4e:fb:e3:f5:d9:59 brd ff:ff:ff:ff:ff:ff 133: vxlan200: <BROADCAST,MULTICAST> mtu 1450 qdisc noop state DOWN group default qlen 1000 link/ether 0e:4e:f4:76:59:3f brd ff:ff:ff:ff:ff:ff 134: vxlan100: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000 link/ether ba:b6:b7:0c:b1:37 brd ff:ff:ff:ff:ff:ff VyOS always sets a default MTU of 1450 bytes which is correct for IPv4 p2p links or multicast, but invalid for IPv6 p2p. Also this will break EVPN deployments as ethernet bridges with MTU < 1500 bytes are less fun. Increase default MTU to 1500 bytes. Migrate old configurations to use 1450 bytes if not specified otherwise on the CLI. (cherry picked from commit 4a163b016333e58fee9d6ec6b53a09e0160b3213)
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