I just posted about this issue to comp.os.linux.networking, but
it occurs to me that this may be a UML issue, and not a general
networking issue.

Essentially, I'm trying the following:

1) using a virtual bridge on the host to wire up all the guests
   to the physical ethernet directly.
2) I have two blocks of IP addresses, in different subnets.
3) I have a guest happily configured to use a single IP address
   from subnet X.

Now, when I tried adding another IP address to the same guest
(from subnet Y), no traffic would pass to that interface.

I tried both an alias inside the guest and using separate tuntap
devices; neither worked... :(

Any hints/tips as to what might be wrong, or how to debug this
further?  I've tried pinging from the host to the new ip on the
guest, and the ICMP packets are nowhere to be found. (according
to tcpdump.)  I do see 802.1d config packets repeating over and
over, which makes me think something lower-layer is not hooked up
correctly.

Thanks in advance for any help you can give,
- majere


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