simple question about dns lookup
into the Black Sun and said: What does the last sentence mean? Write in your native language (or use Babelfish) if you're not comfortable with English; there are a few German...
On comp.os.linux.misc, in
$ host www.yahoo.com www.yahoo.com CNAME www.yahoo.akadns.net www.yahoo.akadns.net A 66.94.230.49 www.yahoo.akadns.net A 66.94.230.50 www.yahoo.akadns.net A 66.94.230.35 www.yahoo.akadns.net A 66.94.230.37 www.yahoo.akadns.net A 66.94.230.39 www.yahoo.akadns.net A 66.94.230.42 www.yahoo.akadns.net A 66.94.230.44 www.yahoo.akadns.net A 66.94.230.46
Vincent Schmid" Simply SOURCEPATH=-home-source will do Although, by convention, all caps is reserved for environment variables, so something like this would be better: SOURCEPATH...
$ dig +short www.yahoo.com www.yahoo.akadns.net. 66.94.230.50 66.94.230.34 66.94.230.35 66.94.230.39 66.94.230.41 66.94.230.47 66.94.230.48 66.94.230.49
$ nslookup www.yahoo.com Note: nslookup is deprecated and may be removed from future releases. Consider using the `dig' or `host' programs instead. Run nslookup with the `-silent' option to prevent this message from appearing. Server: 207.217.120.83 Address: 207.217.120.83#53
Non-authoritative answer: www.yahoo.com canonical name = www.yahoo.akadns.net. Name: www.yahoo.akadns.net Address: 66.94.230.46 Name: www.yahoo.akadns.net Address: 66.94.230.49 Name: www.yahoo.akadns.net Address: 66.94.230.50 Name: www.yahoo.akadns.net Address: 66.94.230.32 Name: www.yahoo.akadns.net Address: 66.94.230.38 Name: www.yahoo.akadns.net Address: 66.94.230.39 Name: www.yahoo.akadns.net Address: 66.94.230.42 Name: www.yahoo.akadns.net Address: 66.94.230.43
You can also use ping, although it does not access the DNS servers as the above utilities do, and not all hosts will respond to a ping request:
$ ping -c 10 www.yahoo.com PING www.yahoo.akadns.net (66.94.230.45): 56 data bytes 64 bytes from 66.94.230.45: icmpseq=0 ttl=57 time=189.7 ms 64 bytes from 66.94.230.45: icmpseq=1 ttl=57 time=159.9 ms 64 bytes from 66.94.230.45: icmpseq=2 ttl=57 time=150.0 ms 64 bytes from 66.94.230.45: icmpseq=3 ttl=57 time=150.0 ms 64 bytes from 66.94.230.45: icmpseq=4 ttl=57 time=160.0 ms 64 bytes from 66.94.230.45: icmpseq=5 ttl=57 time=160.0 ms 64 bytes from 66.94.230.45: icmpseq=6 ttl=57 time=160.0 ms 64 bytes from 66.94.230.45: icmpseq=7 ttl=57 time=160.0 ms 64 bytes from 66.94.230.45: icmpseq=8 ttl=57 time=150.0 ms 64 bytes from 66.94.230.45: icmpseq=9 ttl=57 time=160.0 ms
--- www.yahoo.akadns.net ping statistics --- 10 packets transmitted, 10 packets received, 0% packet loss round-trip min-avg-max = 150.0-159.9-189.7 ms
As you can see, with large organizations like yahoo, there isn't one single IP address.
Notice also that the utilities, run one after another, do not return exactly the same answers.
(I'm running Debian)
AC
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