This is #330673.
From the 1.9-1 changelog:
* Fix /etc/network/if-up.d/ip to not set rp_filter to 1 when it isn't
configured. (Closes: #330673) [debian/ip-if-up]
I'm willing to prepare a SPU upload if the release team desires so.
I agree that it's an important bug when installing a package breaks
your network, I'm not sure whether it's suitable for stable though; it
is still unlikely that someone fiddles with VLANs without local access.
--
Loïc Minier <[EMAIL PROTECTED]>
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