I've got a 16.04 server with interface em1 in my companys a.b.0.0/16 subnet AB. For reasons reasons I can't change, there is a protected subsubnet ABC within this range called a.b.c.0/24 which I only can reach by adding a second network interface em2.
So I connected em2 and brought it up getting a lot of AB packages on em2 (where I expected only ABC packets). And the em2 address is not reachable by computers of the ABC subnet.
ip r s shows me
default via a.b.0.1 dev em1
a.b.0.0/16 dev em1 proto kernel scope link src a.b.0.1
a.b.c.0/24 dev em2 proto kernel scope link src a.b.c.1
What am I missing?
Why are there a lot of packages on em2 as if I am bridging both networks (which I don't want).
There is no ipv4/6 forwarding enabled in sysconf or /proc/sys/net/ipv4/.
Thanks in advance,
Harry
