> I am running an linux server, and I want to limit a logon  id to
> three ip address. is there any way to do this with sshd?

pam's pam_access module will do it.

assuming a RH system...

Create /etc/security/sshd_access.conf
------
-:dude:ALL EXCEPT 192.168.12.2 192.168.12.6 192.168.12.9
+:ALL:ALL
------

Then add it to /etc/pam.d/sshd:
account    required     pam_access.so accessfile=/etc/security/sshd_access.conf

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