> NO, you are not understanding to me... > I�ve clear the ARP concept, and how to configure it.
Sir, respectfully, you are not. > 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. Yes. I understand that. That is a non-sensical thing to do. It may well work in older IPSOs, but that's a bug. ARP is used to discover L2 addresses _on the local subnet_. There is never a need to define a Proxy ARP for an address outside the subnet range of the interface the NAT comes in on. Routing takes care of proper L2 addressing if the NAT is outside the interface's subnet range. And that's the last I'll say on it :). Won't get into a "Am Right!" "Am Not!" "Are Too!" fight with you ;) Shawn > > -----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 > > INTEGRALIS > Your Trusted Security Partner > > 111 Founders Plaza > 13th Floor > East Hartford, CT 06108 > USA > Tel: +1 860 291 0851 > Fax: +1 860 291 0847 > [EMAIL PROTECTED] > > www.integralis.com > > > > > -----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] > > ================================================= > > > > > Please note that: > > 1. 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