Miguel, it definitely still exists, but not sure if anyone will be
working on it.
** Changed in: neutron
Status: Expired => Confirmed
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https://bugs.launchpad.net/bugs/1376446
Title:
Neutron LBAAS agent ignores MTU settings used by subnets
Status in neutron:
Confirmed
Bug description:
The network interfaces in qlbaas namespaces always use 1500 as their
default MTU setting. This may cause trouble when communicating with
instances that have different MTU set (usually through dhcp options
using /etc/neutron/dnsmasq-neutron.conf). Different MTU values may
break communications between instances and load balancers and lead to
weird behaviours, such as some web pages timing out waiting for a
reply while others work.
Manually setting an lbaas namespace to the same value as the instance
corrects any communication problems between balancer and instance.
Neutron should use options from their subnet or at least provide a way
to manually set the load balancer's MTU.
For reference, here is the output of a lbaas namespace settings
showing MTU 1500:
# ip netns exec qlbaas-a38fc742-9c0b-4503-a0b9-64d5a6adfe77 ip a
(...)
234: tape853dd58-66: <BROADCAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state
UNKNOWN group default
link/ether fa:16:3e:a2:e0:c7 brd ff:ff:ff:ff:ff:ff
inet 10.134.54.151/22 brd 10.134.55.255 scope global tape853dd58-66
valid_lft forever preferred_lft forever
inet6 fe80::f816:3eff:fea2:e0c7/64 scope link
valid_lft forever preferred_lft forever
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