> 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. This e-mail may constitute privileged information. If you are not the intended recipient, you have received this confidential email and any attachments transmitted with it in error and you must not disclose, copy, circulate or in any other way use or rely on this information. 2. E-mails to and from the company are monitored for operational reasons and in accordance with lawful business practices. 3. The contents of this email are those of the individual and do not necessarily represent the views of the company. 4. The company does not conclude contracts by email and all negotiations are subject to contract. 5. The company accepts no responsibility once an e-mail and any attachments is sent. http://www.integralis.com ================================================= 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] =================================================
