Protect Attribute from external rewriting!

Erling Paulsen erling.paulsen at
Mon Feb 26 10:22:56 CET 2007

I'm hoping someone can help me with the following problem:

Some of our users gets proxied to external home-servers. We assign them 
to a wireless Vlan (guest-vlan) via rewriting the 
'Tunnel-Private-Group-Id:0 := "xx"' Attribute.

Is there a convenient way of safeguarding/checking this attribute in the 
reply message, so that it has not been rewritten externally and thus 
giving users access to restricted Vlans?

I'm guessing it has something to do with the 'post-proxy' section, but 
I'm kindof blanc to what must be done - so I would appreciate any hints 
to get me started!

Erling Paulsen

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