Hi, Why do you need to configure an ARP entry for a network you are not connected to? Such an ARP entry is of no use at all.
Colin -- Colin Campbell ITS DCS Security Natural Resources, Mines and Energy Ph: (07) 389 63129 Fax: (07) 389 63740 > -----Original Message----- > From: Mailing list for discussion of Firewall-1 > [mailto:[EMAIL PROTECTED] Behalf Of Mateo > Cabrera - Security Advisor > Sent: Wednesday, 28 April 2004 7:43 AM > To: [EMAIL PROTECTED] > Subject: Re: [FW-1] PROXY ARP, PROBLEM...!!! > > > 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 > > 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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