why don't you just configure an IP-address from this subnet on the interface? a secundary IP is no problem with ipso ...
cheers reinhard
At 23:43 27.04.2004, you wrote:
NO, you are not understanding to me... I�ve clear the ARP concept, and how to configure it. The problem is when i try to configure a ARP entry with a IP which does not belong to IP range configured on this interface. This does not work on NG version, However the same configuration in 4.1 does work fine....
So long...
Saludos,
Mateo Cabrera - Soporte T�cnico Security Advisor Soluciones en seguridad inform�tica Constituyente 1467 of. 802 Tel/Fax: (598 2) 4004378 11200 Montevideo-Uruguay
-----Mensaje original----- De: Mailing list for discussion of Firewall-1 [mailto:[EMAIL PROTECTED] nombre de Shawn Behrens Enviado el: martes, 27 de abril de 2004 11:11 Para: [EMAIL PROTECTED] Asunto: Re: [FW-1] PROXY ARP, PROBLEM...!!!
> I want to create a PROXY ARP entry on a interface (e.g eth0), > but this IP > belong to addresses NOT CONECTED DIRECTLY on this interface.
Yeah, that's, hmm, an odd thing to want to do.
> You understand to me?
Sort of. I know what you wish to do, and I _think_ I know why: You're slightly confused about ARP :).
ARP is used to discover Layer-2 (MAC) addresses. Logically, then, when you think about the way routing works, ARP is necessary ONLY for addresses on the same subnet as the client's address. Proxy ARP allows the firewall to respond to an ARP request for an address it does not physically have, usually used for NAT addresses that are in the same subnet as the firewall's interface that the NATed traffic comes in on.
If your NAT address is outside the firewall interface's subnet, all that's needed is that the upstream router(s) know to route this traffic to the firewall. Proxy ARPs are not necessary.
Go and study Layer-2/Layer-3 addressing interaction some more. It's an area oft overlooked, as it seems so basic, yet a good understanding will do wonders for the clarity of your network designs.
Regards
Shawn Behrens Senior Security Engineer CCMSE CCSE CCNA CNE
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> -----Original Message----- > From: Mateo Cabrera - Security Advisor > [mailto:[EMAIL PROTECTED] > Sent: Tuesday, April 27, 2004 8:28 AM > To: [EMAIL PROTECTED] > Subject: [FW-1] PROXY ARP, PROBLEM...!!! > > Saludos, > > Mateo Cabrera - Soporte Tecnico > Security Advisor > Soluciones en seguridad informatica > Constituyente 1467 of. 802 > Tel/Fax: (598 2) 4004378 > 11200 Montevideo-Uruguay > > ================================================= > To set vacation, Out-Of-Office, or away messages, > send an email to [EMAIL PROTECTED] > in the BODY of the email add: > set fw-1-mailinglist nomail > ================================================= > To unsubscribe from this mailing list, > please see the instructions at > http://www.checkpoint.com/services/mailing.html > ================================================= > If you have any questions on how to change your > subscription options, email > [EMAIL PROTECTED] > ================================================= >
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