Did you check in /etc/sysctl.conf that IP packet forwarding was enabled?
David Glaser Systems Administrator LSA Biophysics University of Michigan -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Florin Andrei Sent: Friday, August 03, 2007 2:29 PM To: Red Hat Enterprise Linux 5 (Tikanga) discussion mailing-list Subject: [rhelv5-list] proxy ARP not working, why? Router / firewall running the RHEL 5 code, doing DNAT. Cluster of servers behind the firewall, on private IP addresses. The external interface of the firewall is on public IP address space. Each server private address in the cluster is DNAT'ed by the firewall to its own public IP address residing on the external interface of the firewall in the public space. The problem is, when testing the connection through the firewall, I see the initial ARP request for the DNAT'ed public address of the server, but there's no reply. The firewall must be instructed to respond to that request. 10 years ago I was doing something similar on Slackware (kernel 2.0 or something like that), it was called proxy ARP and it was a straightforward job. But now it's a pain in the ass. Any idea if RHEL 5 is doing something "special" that might prevent proxy ARP from working? -- Florin Andrei http://florin.myip.org/ _______________________________________________ rhelv5-list mailing list [email protected] https://www.redhat.com/mailman/listinfo/rhelv5-list _______________________________________________ rhelv5-list mailing list [email protected] https://www.redhat.com/mailman/listinfo/rhelv5-list
