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Question on routers performing ARP requests etc..

Posted on 2004-11-06
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Last Modified: 2010-04-17
Ok, say I have 2 networks


Router1  s0  -------------------------------  s0 Router 2
  e0                                                        e0
   |                                                          |
   |                                                          |
Host 1                                                 Host 2

Host 1 sends a packet to Host 2.  Host 1 first does an ARP request to locate the physical address of its gateway (router 1).  It receives the ARP response and sends the frame to Router1.

Router1 receives the frame and de-encapsulates it by removing its ethernet frame. Router 1 examines the dest address and sees that it has to send the frame out it's s0 interface.  My question is:
Does Router1 performan ARP request before deciding to send the frame to Router2???
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Question by:dissolved
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Don Johnston earned 2000 total points
ID: 12514620
No.

MAC addresses are for LAN's (Ethernet in this case).

The L2 destination address on point-to-point serial links (PPP, HDLC) is 0xFF. Since there can only be one other device on a point-to-point serial link, there's no reason for a unique address.

-Don
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by:dissolved
ID: 12514648
Thanks!
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