** Changed in: network-manager
Status: Unknown => Fix Released
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https://bugs.launchpad.net/bugs/1967626
Title:
22.04 beta Network Manager still sets wrong IPv6 routing
Status in NetworkManager:
Fix Released
Status in network-manager package in Ubuntu:
Confirmed
Bug description:
Hi,
that's a bug I've already reported earlier both to ubuntu and network-
manager upstream, and nobody seems to care about.
I'm using an AVM FritzBox, a router family very common in Germany and
Europe for DSL and DOCSIS, but saw reports of people confirming the
problem with other routers.
The router sends ICMPv6 router advertisements, which contain for both
the configured site-local address and the provider-assigned world-
routable address range both a
* prefix information
* router advertisement on itself
All other OS and machines I have, including
* Debian
* Ubuntu Server
* Ubuntu Core
* Raspberry Pi OS
* Other Linuxes
* MacOS
*...
correctly set a link route on the network device for both the official
and the site local address.
Only Ubuntu Desktop machines with that damned Network Manager set a
route to the router instead of a link route.
The consequence is, that IPv6 still works, but significantly to slow,
since packages are not switched on the network switch, but routed on
the router, which dramatically decreases speed.
I've reported this upstream to Network Manager, see the discussion on
https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/issues/840
but they do not even seem to understand the issue (Network Manager
written by people not really understanding routing...)
Their point of view is that the router will fix things by sending
redirects. However, ICMPv6 redirects are considered a security problem
and usually recommended to be turned off.
The answer from NetworkManager developers is to fix the router, not
the Network Manager to stop sending router advertisings, but can't
explain why all other OS and other Linux distributions, including
Ubuntu server and Ubuntu core do it correctly, and just NM doing it
wrong.
So Ubuntu/NetworkManagers unability to fix or even notice this
essential problem forces people to either accept terribly slow IPv6
traffic in local networks, or to leave the machine open for ICMPv6
redirects, which, in general, is a security flaw and vulnerable.
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