brian dell wrote:
> 
> take for example a configuration from a cisco router
> where is the encapsulation conf ? and for all the confs i have
> seen for ethernet interfaces there is no encapsulation command.
> i guess when there is no encap conf for an ethernet interface,
> the ios assumes it is arpa ? is that correct ?

I don't have the capability to configure the encapsulation on my Ethernet
interfaces either. Someone else sent an IOS config guide that says you can
do it (FOR IP PACKETS), but I wasn't able to. Anyone else able to?

The IOS defaults to an encapsulation depending on the packet type. It
defaults to ARPA for IP. It defaults to novell-ether for Novell. It defaults
to SNAP for AppleTalk, CDP, VTP, others. It defaults to sap for STP.

You have me worried with this "the ios assumes it is arpa" statement. That's
just for IP. There is no default encapsulation type for Ethernet in general.
It depends on the packet type. Get the free Ethereal protocol analyzer and
check it out. I think you would enjoy it. Here's a lab exercise you could do:

http://www.troubleshootingnetworks.com/ethernet.html

Priscilla


> 
> 
> interface eth0
>  ip address 192.168.1.1 255.255.255.0
>  




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