Re: Layer 2 Trace

["Gary E. Miller" <gem () rellim com>]

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Yo James!

On Fri, 2 Dec 2005, James Eaton-Lee wrote:

> Layer two only provides connectivity to machines attached to the same
> segment.

You have to be very carefull on what denotes a segment.  What with
bridges and tunnels that segment could have a crazy topology.  I have
ethernet segments that span 2 states using bridge style tunneling.

> In the case of ethernet, this means the local network segment,
> such as a 192.168.0.1/24 class C subnet of 255 hosts - in order to
> communicate with hosts on a wide area/extended/inter network (ie. across
> more than one local network), traffic needs to be routed (which occurs
> at layer three).

You are confusing layer 2 and layer 3.  There are no IPs on layer 2!

I often put several layer 3 IP subnets on one physical layer 2 net.  You
can do this with or without using VLAN tagging.

RGDS
GARY
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Gary E. Miller Rellim 20340 Empire Blvd, Suite E-3, Bend, OR 97701
        gem () rellim com  Tel:+1(541)382-8588 Fax: +1(541)382-8676

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