So, I'm in the middle of trying to get a freakin' ipsec gateway working,
and I've run into an ugly problem.

It *appears* that the functionality of publishing arbitrary ARP responses
has been changed and is now shunted through proxy ARP.

Backstory: Ipsec can be coerced (with much swearing) into handling things
using routing rather than passing everything through the iptables
masquerading module.  Except, the resulting ip_vtiX interfaces don't use
ARP, so the box isn't about to do ARP replies to hosts trying to talk *back* to
the VPN clients.

In the past I've just slapped some static published entries for the
affected IP addresses with the arp command and the box would happily
respond to ARP WHO-HAS for 1.2.3.4 or whatever address I wanted.  Setting
aside for the moment the fact that `ip neigh` is about as pleasant to work
with as a coked-up honey badger, static published entries just *don't
appear to result in responses to other querying hosts on the network
anymore* using either mechanism.

Does anyone know a workaround for this mess?  ...although I'd really like
to know who decided it was for the best that proxy arp be used as a
last-minute sanity check on published ARP entries.

-- 
Sent from an actual computer.

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