Ref: 03250409
Title: IB Route Options and How to Implement
Date: 4/5/88

Copyright 3Com Corporation, 1991.  All rights reserved.

QUESTION:  Could you explain what the four IB route options are
and how we implement them?  The manual is very unclear on this.
Even the filter examples are unclear.  They tell you to use hex
for the offset, but one of the examples has an offset of 13!

ANSWER: The four options for add routes are: (these are also in
the manual)

1)  Disable:  Disables forwarding of the packet with this
destination. User 'learned' address. This is useful if you want
isolate a device on one side from the other.

2)  IB:  Forwards the packet to the IB, but does not forward it
to the other side. Useful to "not forward", but also the log
function can be used to count packets. <<changed.  OK?>>>>

3)  Netsand IB:  The packet is forwarded to the other net and
to the IB, i.e., broadcast.

4)  Nets only:  Forward to the other net without going to the IB.
Useful for heavy networks to do this with broadcast, but the IB's
netmap packet will not be sent on to the network.  This will
reduce mcpu overhead.

On the filter question, the offset %13 (which is decimal 19) is
the offset in the packet that shows the type of XNS packet.

