Try:
http://roy.marples.name/projects/openresolv
Nothing wrong with dhcp hooks. Setup things as advanced as you need.
Dnsmasq regularly sends *all* requests to *all* nameservers and picks
the fastest responding. So it will choose a faster responding server
where there are several options
Ed W
On 10/11/2012 15:54, /dev/rob0 wrote:
Seems to me that dnsmasq is a better nscd replacement, and it has a
place in mobile computing.
# we use this dnsmasq as this system's own resolver
no-resolv
# I'm not sure if both of these are needed; we only want DNS and
# only on loopback; we serve only this machine.
no-dhcp-interface=lo
listen-address=127.0.0.1
user=dnsmasq
group=dnsmasq
# When connected to VPN, these names/addresses resolve. When not
# connected, they don't, but that's okay, because we can't get to
# them anyway.
server=/rob0.vpn/192.168.6.1
server=/6.168.192.in-addr.arpa/192.168.6.1
# upstream: Google Public DNS
server=8.8.4.4
The problem here is when you might not want to use 8.8.4.4, such as
when you're at a dnsmasq site where internal DNS is working. The
solution, I guess, would be a hook in the DHCP client to write the
DHCP-obtained nameserver[s] to a dnsmasq.d/file to include, and
signal or restart dnsmasq.
Problem with that solution: will dnsmasq.d get crufty, or do we just
reuse the same file? Also, what if one of the mobile connections is
not handled by DHCP, such as some cellular data connections?
Speaking of cruft, maybe that's not a bad thing? What will dnsmasq do
with multiple upstream servers?
server=192.168.40.1
server=192.168.0.1
server=192.168.1.1
server=8.8.4.4
When we're at a site where one of those is our router, that should
respond much faster than 8.8.4.4 can. OTOH, it could cause
intermittent errors with local names; 8.8.4.4 is not going to know
"minipax.rob0.lan".
Can we priortise upstream servers? --all-servers implies that this
can be done somehow, but I don't know how ... is it merely the order
in which they are listed in the config (or on the command line)? When
not using --all-servers, how does dnsmasq decide when to try a
different one, and which one will be tried in that case? Random
selection, rotating sequential, fixed top-down priority?
Ideally we'd want something which you set up one time and is mostly
done; something that should work at regular sites you frequent, as
well as most public hotspots.
--
http://rob0.nodns4.us/ -- system administration and consulting
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