[newbie] DNS questions

[Frank Bax]

I have three Linux machines on the same network with a bunch of windows 
machines.  The ip address of the server hosting corporate email changed 
last week, but the old ip address was only "unplugged" yesterday.  Two of 
the linux machines are unable to download email and "ping" attempts to 
connect to the old ip address.  reboot didn't help.  Third linux machine 
and windows machines are working fine.  Looks like a dns issue.  What tools 
do I use to determine which nameserver Linux is using, what ip address that 
name server is providing for the server we are trying to reach?

Frank


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