well, part one should be easy with the aforementioned modules, and for part two you would just have to change the relevant files (/etc/hostname.hmeX, /etc/hosts, /etc/netmasks on solaris; /etc/sysconfig/network, /etc/resolv.conf, /etc/sysconfig/network-scripts/ifcfg-ethX for linux) and restart the network, this can be done in very few lines using perl -i to edit these files and restart the network.

#!perl -i

@ARGV = ("/etc/hosts");
while(<>){
  s/OLDIP/NEWIP;                # change the ip
  s/OLDHOSTNAME/NEWHOSTNAME;    # change the hostname
  print;                        
} # repeat a while loop like this for all of the network files.
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Hope this helps. -malloc