Here is my story.

I have 2 computer, one 192.168.1.1, one laptop 192.168.1.2, and one wireless router at 192.168.1.254

The wireless router have a administration web.
I can access it trough http://192.168.1.254

Then, I changed my laptop to 192.168.1.254 and my PC is fooled not accessing the web of wireless router but the laptop's website.

After i changed laptop to 192.168.1.2, then the PC(192.168.1.1) is still fooled. Instead of accessing the access-point web, it go to laptop's web, when I ask it to go to http://192.168.1.254

Then, I do this at PC(192.168.1.1):
^^sorry if I'm mistaken here, but surely I have read the man page and the parameter I give is the parameter to delete host.

but the PC is still fooled.

How to really clear the arp-cache?

Thank you very much...

sudo arp -s 192.168.1.254 00:20:78:xx:xx:xx

drop the sudo part if you are root, use MAC Address of router for 2nd param

that will force the right MAC addr.

If you can ping from router to 192.168.1.1, that should update the arp cache with the correct entry as well. Also ping 192.168.1.1 from 192.168.1.2, that should update the cache to correct information without forcing entries.

Are these IP assigned through DHCP or are they static IP addresses. Also what type of router do you use.

Ah! Thanky you very much.

Forcing the arp to the correct MAC-Address is really make sense. Why didn't I think about that?

All is static IP Address, though my ASUS Router have DHCP Server.

My router is ASUS WL-500g(WLAN Router)

Thank you very much again....