NAT IP and Google

They take out our campus, both IPv4 and IPv6.

All hailing attempts fail.

Good luck.

Their determination is based on the type of search traffic more than the volume. I had some success using squid to proxy through to them and reduce the overall number of complex queries.

If at all possible, consider using a NAT pool instead of translating
all outbound web traffic to a single IP address. When I ran
Tribune's network (with about 15K internal client IPs), we were
blacklisted by Google several times due to high query volumes. In the
end I built a pair of /24 NAT pools, so for example all internal
10.x.y.124 addresses are translated to "".

In my experience, Google does temporary blacklisting based both on
rate and also for certain types of queries; you can reduce your chance
of a ban by using a smart proxy to rate-limit or deny certain types of
query, or to choose the source address based on the URL requested,
basically have a "low risk" and a "high risk" source address.

This works out especially well if you are using VOIP behind said NAT. :wink: