** Changed in: network-manager (Ubuntu Precise)
Status: Triaged => In Progress
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https://bugs.launchpad.net/bugs/1038541
Title:
Network Manager copies IPv6 route cache entries to main routing table
Status in NetworkManager:
Fix Released
Status in “network-manager” package in Ubuntu:
Fix Released
Status in “network-manager” source package in Precise:
In Progress
Bug description:
Any time an IPv6 route lookup happens, the kernel generates a new
routing cache entry and notifies userspace using a netlink "new route"
message with the RTM_F_CLONED flag set on the route.
Network Manager doesn't check for this flag, so it accepts it as a new
real route and adds it to its internal route cache. Then, because the
event triggers an interface update, it synchronizes its route cache
with the kernel table, putting the cache entry in as a real host
route.
I think NM might also overwrite the next hop of the route based on its
internal idea of the default route, but I'm not sure.
This causes problems if you have interfaces not managed by
NetworkManager, such as manually configured VPNs, since these host
routes override the route entries that send traffic down those
interfaces rather than to the default router.
To reproduce:
Ensure "Ignore automatically obtained routes" is unchecked in Edit Connection
-> IPv6 -> Routes, because this blocks the last stage (copying the spurious
route back to the kernel).
Connect to an IPv6 network.
run `ip -6 route` and observe no extra routes
run `ip -6 route get 2600::`
run `ip -6 route` again and observe the new static route to 2600:: via your
default gateway
Expected behavior:
No changes to routing table due to a route lookup.
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