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Re: DNS server failed,all other servers unable to login

 
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stephen peng
Valued Contributor

Re: DNS server failed,all other servers unable to login

furthermore, I could not telnet localhost when the problem happened.
John Guster
Trusted Contributor

Re: DNS server failed,all other servers unable to login

you have ARP in cache which might help in ping.
Steven Schweda
Honored Contributor

Re: DNS server failed,all other servers unable to login

> [...] I could not wait to estimate how long
> it would hang

How long did you wait before you decided not
to wait? Milliseconds? Minutes? Hours?
Days? Any useful info at all?

> [...] (would this force telnet to query dns
> server without plan b even I did not use
> hostname?) [...]

The Telnet server normally tries to get the
name of the client by looking up its IP
address. It doesn't care how the client
found the server. If this (reverse) look-up
is slow (or hangs), then the Telnet
connection may be slow (or hang).

> furthermore, I could not [...]

"I could not" remains useless as a problem
description.

> you got post info to us:
> [...]

It would probably help if we had some idea of
the IP addresses, netmasks, routes, and so
on. Your opinion of the configuration is
interesting, but may be less valuable than
actual facts.
stephen peng
Valued Contributor

Re: DNS server failed,all other servers unable to login

attached file present some information of network status.
rick jones
Honored Contributor

Re: DNS server failed,all other servers unable to login

Doesn't really help directly, but I will note there is a reason that DNS serving is generally two or more systems and why the /etc/resolv.conf file can take more than one nameserver entry. It is to provide redundancy in the face of server failures.

If there is no nsswitch.conf file, the name resolution code assumes a particular set of defaults, which includes using DNS (IIRC).
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