Re: ip + mac authentication

Daniel VRABIOIU <danyvip@xxxxxxxxx> · Wed, 19 Jan 2005 17:53:53 +0200

arp -f only force for an ip a static mac. so you cant specify 2 mac 
addresses or 2 ips in ethers. you can do that using iptables instead.

also, if you dont know the mac associated with an ip then you can ping 
it then use arp to see it. if an ip isnt listed in ethers then it can be 
used with any mac address.

Linux Query wrote:

Thank you! I didnt know about the /etc/ethers file. Is
it possible to assign two ips for a single mac in that
file and a single ip for two macs ?

e.g.   ip1   <mac1>

      ip2   <mac1> 

and

      ip3   <mac2>

      ip3   <mac3>  

Besides, if i leave out some of the clients from the

/etc/ethers file (I dont know all mac addresses right

now) , will it create problems for those who are not

included ?

Thanks and regards,

jim