Session Cookies - Detecting Specific User-agent/IP?

I'm new to using session cookies and need just a bit of help. On the introduction page to my project, I'm setting:

<%@ Language=VBScript %>
<%
response.cookies("user")="authenticated"
%>

Then, on subsequent pages, I'm checking for the cookie, and redirecting if it's not there:

<%@ Language=VBScript %>
<%
If NOT request.cookies("user") = "authenticated" Then
response.redirect "http://somepage"
End If
%>

What I need to do is incorporate an ignore element (by user-agent or IP) into where it checks for the cookie. For instance, if a user has an IP of 127.0.0.1, it ignores whether they have the cookie or not and lets them view the page.

The reason I'm doing this is I have a search engine that's crawling the site and it doesn't always go through the front page - therefore, it's getting redirected on most of the pages it sees. So what I'd like to do is have the script see that user-agent or IP, then ignore the cookie requirement.

Is that possible?