[Users] Ipsec & arp pbs

Hi All,

I've got a trouble with Ipsec & arp on an IPsec Gateway, any help is appreciated.

The network is the following:

Private network A -- Ipsec Gw A -- Router -- Ipsec Gw B -- Private network B

On Ipsec Gw B / without Ipsec not running :
- I can ping everywhere, arp tables are ok

On Ipsec Gw B / with Ipsec running:
- I can ping everywhere (of course except private networks) except the local interface of the router in front of Gw B(but can ping over the router, ie the Ipsec Gw A) ???

• Ipsec SA is established (but VPN does not work)
• The Gw B arp table is empty.
• ping to the router in front of Gw B fails with "invalid argument", no frame is going out of Gw B (tcpdump on router shows it)
• I do not success to update the arp table with "arp -s"

Gw B is Freeswan 1.97
Gw A is Freeswan 1.98

It seems that Ipsec is modifying the arp protocol but I do not know the way he is doing that, can somebody help? Many Thanks,
Alain

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