Communication problem between Same Subnet

[vikas kumar]

Dear all,

we have IPsec VPN between branches using cisco router.

problem we are facing we can communicate between branche util we do clear arp.

please assist

regards

vk

[andrew.prince]

Why are you clearing the ARP table?

[vikas kumar]

Dear andrew

Thanks fro reply, we are clearing Arp table on Routers after that its start communicating.

i dont know what logic working, but after that it works.

please assist.

thanks with regards

vk

[garapoglou]

Hi,

Clearing the ARP table all the time is definitely not right.

Have you inspected those ARP entries before deleting them? The number of hosts on each network is not big, so I think you need to check the ARP entries on the routers to see what's wrong.

Best regards,

Giorgos

[vikas kumar]

Dear Gioagos

Thanks for reply, I know this is not right way to clear all time Arp table.

before i do Clear Arp command, i check all enties are right.

one more think iwant to tell you all links we are using for provided By ISP, we are using Public IP as external IP (WAN)

internal range is Private IP VPN connectivity between branches.

we have Communication Problem between Public IP range. after clear arp they start communication and VPN Tunnel

also comes UP

please help us

thanks with regards

vikas kumar

[garapoglou]

Dear Vikas,

Are those public IP addresses provided by the ISP static or dynamic?

Giorgos

[vikas kumar]

Dear Giorgos

Thanks for reply, all IP address's are provided by ISP and all are Static IP.

this problem we having with only cisco devices. other are having same issue with same setup in this network.

ISP is running these commonds for all switchs ports

switchport protected

switchport block multicast

switchport block unicast

it is not cousing problem

please assist,

kind regards

vikas kumar