From: John Senkow (SENKOWJ@wyeth.com)
Date: Wed Dec 08 2004 - 10:56:46 GMT-3
Remember, there is a ARP table and a CAM table.
Your test may create a new CAM entry, but because there was no need to
send an ARP request, the ARP table was not updated.
-John Senkow
>>> <wing_lam@jossynergy.com> 12/8/2004 5:15:14 AM >>>
Hi,
But why when 10.1.1.40 replies, the multi-layer switch not capturing
it's
source MAC address?
Also, what device will reply to 10.1.255.255? I have a lot of devices
here
but why only this replies?
Thanks,
BBD
|---------+--------------------------------------------->
| | "Hoonpongsimanont, Chalermchai" |
| | <chalermchai.hoonpongsimanont@atos|
| | origin.com> |
| | Sent by: nobody@groupstudy.com |
| | |
| | |
| | 12/08/2004 05:45 PM |
| | Please respond to |
| | "Hoonpongsimanont, Chalermchai" |
| | |
|---------+--------------------------------------------->
>----------------------------------------------------------------------------------------------|
|
|
| To: wing_lam@jossynergy.com, ccielab@groupstudy.com
|
| cc:
|
| Subject: RE: Can anybody explain why
|
>----------------------------------------------------------------------------------------------|
Hi,
I think this is because router did not send out arp request for the
broadcast IP address. It already know MAC address for broadcast,
right?
When ICMP echo packets were sent out to broadcast address, router just
encapsulated them with destination mac address as broadcast.
But if you show on 10.1.1.40, you will see arp entry for 10.1.0.100.
This
is
because when 10.1.1.40 sent back echo reply, it unicast to 10.1.0.100.
Hope this help,
David
-----Original Message-----
From: wing_lam@jossynergy.com [mailto:wing_lam@jossynergy.com]
Sent: Wednesday, December 08, 2004 4:20 PM
To: ccielab@groupstudy.com
Subject: Can anybody explain why
Hi Group,
I am try pinging the broadcast on a network, with only 1 device
replies.
But I cannot see it's arp, why?
Router#p 10.1.255.255
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.1.255.255, timeout is 2 seconds:
.
Reply to request 1 from 10.1.1.40, 33 ms
Reply to request 2 from 10.1.1.40, 8 ms
Reply to request 3 from 10.1.1.40, 9 ms
Reply to request 4 from 10.1.1.40, 9 ms
Router#sh ip arp
Protocol Address Age (min) Hardware Addr Type Interface
Internet 10.1.0.100 - 000f.2406.7840 ARPA Vlan1
Internet 10.1.0.1 0 0008.027f.da1d ARPA Vlan1
Internet 10.1.1.1 0 000f.fe14.dc61 ARPA Vlan1
Router#sh run int vlan 1
Building configuration...
Current configuration : 60 bytes
!
interface Vlan1
ip address 10.1.0.100 255.255.0.0
end
Thanks,
BBD
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