ARP Question

tntcoder

tntcoder

tntcoder

Soldato
Joined
7 Apr 2004
Posts
4,212
Hi,

Just trying to learn how ARP caching works, my network looks as follows:

lannv9.png


Now after a clean reboot on the wireless laptop, i vist google, i would assume this would cause 192.168.1.45 to be added to the arp cache with is MAC address.

But only 192.168.1.1 is added,

Code: 
Interface: 192.168.1.5 --- 0x2
  Internet Address      Physical Address      Type
  192.168.1.1           00-30-54-75-ef-47     dynamic

Why is this? I mean I could understand if both routers were added, but the laptop has to connect to the wireless router in order to get the ip of the wired router doesn't it? The wired router is the default gateway on the laptops NIC, but theres still communication via the wireless router which should require its MAC address in the arp table?

Thanks
Jack
 
The 192.168.1.45 is effectively a management interface, the traffic is just passed through to the relevant endpoint.

If you connect to the WAPs management page or ping 192.168.1.45 you should see the entry in your ARP cache.
 
Also would the laptop would just look at the TCP/IP settings for the Gateway/DNS so would send an ARP request saying:

Laptop: 'Who has 192.168.1.1'
Router: 'I have that address heres my MAC'

Laptop adds the MAC address into the ARP cache for that IP.
 
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