really hetero networks and firewalls

[cjs @ inms-db . os . dhhs . gov (Carolyn Sienkiewicz)]

I've been reading the firewalls list for a while now, and the information
has been really interesting.  One thing I've been wondering is how would
a firewall fit into the environment in which I'm currently working.  I
work on machines that sit on network segments that host other UNIX machines,
Banyan Vines, Novell, and tons of PCs, so the protocols here are mixed
on just about every segment of the network.  So, if I were to contemplate
putting a firewall up SOMEWHERE on our network as part of an attempt to 
improve UNIX host security, and if the firewall was perhaps doing some
IP filtering and providing application proxies...what about the "other"
protocols flying around?  Do "other protocol" boxes have to be outside
the firewall?  Can non-IP be tunnelled through the firewall?

Please e-mail me rather than expend list bandwidth.  I'll be glad to
summarize for any others who may be likewise uninformed.

Thanks in advance,

Carolyn S.
===================================
cjs @
 inms-db .
 os .
 dhhs .
 gov