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Clear ARP-Cache

September 15, 2011 by Igor Drobot Leave a Comment

Stupid situation if device X tries to communicate with Bob, but Bob send no answer to request. Bob has a problem, his ARP table is broken and he cant reach X.

Solve this problem by clearing the ARP information table:

Flush all arp enties on interface eth1:

1
ip neigh flush dev eth1

ip neigh flush dev eth1

Flush arp entry for host 10.1.100.40:

1
ip neigh flush 10.1.100.40

ip neigh flush 10.1.100.40

Flush ARP entry for for network 192.168.222.0/21:

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ip neigh flush 192.168.222.0/21

ip neigh flush 192.168.222.0/21

Flush all ARP entries:

1
ip neigh flush all

ip neigh flush all

Show ARP Table:

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arp -a

arp -a

Filed Under: Linux, Networking Tagged With: ARP, ARP cache, clear ARP

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