Penetration Testing mailing list archives

Re: Layer 2 Trace


From: James Eaton-Lee <james.mailing () gmail com>
Date: Sat, 03 Dec 2005 20:00:45 +0000

On Sat, 2005-12-03 at 11:44 -0800, Gary E. Miller wrote:
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.

I was trying to explain the distinction between a layer 2 segment and a
larger network operating over layer 3 using layer 3 terminology - not
quite confusing the two, but yes, you're right, I should have been
clearer there. 

What I would have said if I'd had any sleep would have been: "Layer two
only provides connectivity to machines attached to the same
segment. In the case of a layer three network using TCP/IP this means
the local network segment, such as a 192.168.0.1/24 class C subnet of
255 hosts". This subnet has layer two connectivity - anything further
afield doesn't". ;)

 - James, who will now proceed to get some sleep

RGDS
GARY
- ---------------------------------------------------------------------------
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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-- 
James (njan) Eaton-Lee | 10807960
Semper Monemus Sed Non Audiunt, Ergo Lartus - (Jean-Croix)

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