Restrict access to a web service via IP Address?

[grindel]

As the title says, I'm looking at ways to restrict access to a web service (WAS 5.1.1.3 on Solaris). I'm looking at two options:
1) username/password authentication
2) IP address restriction

For case 1, I have Global Security enabled already (to restrict access to the adminconsole. Can I use this fact to somehow authenticate users to the same registry?

For case 2, I have yet to see any reference in any documentation that would sugges this is even possible.

Any thoughts would be appreciated.

Thanks
Rick