BSNL DataOne’s DNS
The manual I got asked me to use 184.108.40.206 and 220.127.116.11 as the domain-name servers, but it appears that this is not really optimal. I found other sources, and confirmed by looking at one particular DataOne manual.
Here are the first few lines of my /etc/resolv.conf now:
nameserver 18.104.22.168 #BSNL, primary for South, secondary for North nameserver 22.214.171.124 #BSNL, primary for North, secondary for South nameserver 126.96.36.199 #BSNL, primary for East nameserver 188.8.131.52 #BSNL, secondary for West nameserver 184.108.40.206 #BSNL, primary for West, secondary for East nameserver 220.127.116.11 #OpenDNS nameserver 18.104.22.168 #OpenDNS
The first one is really faster slightly (about 63 ms instead of 79 ms, or so), but I doubt if it matters…
[Update, asked in the comments: use this on Windows.]