For the ones who are interested why the system behaves a bit awkward
regarding the IPv4 gateway, I have the following info:

It is caused by the fact that reverse path Filtering = on (RFC3704)
These kernel settings are found in /etc/sysctl.conf:

net.ipv4.conf.all.rp_filter = 1
net.ipv4.conf.default.rp_filter = 1

Change this to 

net.ipv4.conf.all.rp_filter = 0
net.ipv4.conf.default.rp_filter = 0

Reboot the system for these settings to take effect.
After the reboot, the system accepts packets with a source IP outside the
range of the connected lan, even without the need for the default gateway to
be configured.

We tested this with and it works fine.

Geert Liesveld.



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