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How to permit ARP traffic between only two hosts



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#1 mashti

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Posted 22 January 2011 - 12:16 AM

There are (at least) 2 methods to permit ARP traffic between only 2 hosts. Vlan Maps & ARP Inspection.

Host 1 (IP: 1.1.1.46 MAC: 0000.0c46.4646)

Host 2 (IP: 1.1.1.64 MAC: 0000.0c64.6464)


Using Vlan Maps

mac access-list extended ARP
 permit host 0000.0c46.4646 host 0000.0c64.6464 0x806 0x0
 permit host 0000.0c64.6464 host 0000.0c46.4646 0x806 0x0
 permit host 0000.0c46.4646 host ffff.ffff.ffff 0x806 0x0
 permit host 0000.0c64.6464 host ffff.ffff.ffff 0x806 0x0
 deny   any any 0x806 0x0
 permit any any
!
vlan access-map VLAN_46_ARP 10
 action forward
 match mac address ARP
!
vlan filter VLAN_46_ARP vlan-list 46
0x806 is the ethertype for arp packets, ffff.ffff.ffff is the L2 broadcast address used by arp when a host is sending the initial arp request in order to find the mac address of the other host.


Using ARP Inspection

arp access-list VLAN_46_ARP
  permit ip host 1.1.1.46 mac host 0000.0c46.4646
  permit ip host 1.1.1.64 mac host 0000.0c64.6464
!
ip arp inspection vlan 46
ip arp inspection filter VLAN_46_ARP vlan 46

The arp access-list includes the mappings between the ip and the mac of each host that should be allowed to send arp packets
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#2 xcke

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Posted 02 February 2011 - 09:02 PM

Thanks

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#3 elkhoubza

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Posted 28 February 2011 - 08:28 AM

thanks

#4 fragilemohi

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Posted 26 December 2011 - 07:37 AM

thanks

#5 Crackingfever

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Posted 10 July 2012 - 12:56 PM

Thanks man....

#6 bonaga

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Posted 20 November 2013 - 04:18 PM

thanks, it's very helpful




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