Hi, It is possible to change the source address of ICMP error messages generated by the kernel via /proc/sys/net/ipv4/icmp_errors_use_inbound_ifaddr. This is currently the only way to influence the source address as ICMP errors do not travel through the NAT table (for obvious reasons). We have the situation that our routers use RFC1918 addresses on their transfer networks (which should be quite common nowadays to save on public IPv4 addresses). ICMP errors are generated with RFC1918 source addresses and therefor never reach the original sender. Every router has its public IP address bound to dev lo to be reachable even if any one interface is down. Routing protocols assure that. Is it a good idea to develop a kernel patch that makes it possible to select the first IPv4 address on dev lo with scope global as the source address for ICMP errors? Would that do any harm to the Internet at large? Regards -- Robert Sander Heinlein Support GmbH Schwedter Str. 8/9b, 10119 Berlin http://www.heinlein-support.de Tel: 030 / 405051-43 Fax: 030 / 405051-19 Zwangsangaben lt. §35a GmbHG: HRB 93818 B / Amtsgericht Berlin-Charlottenburg, Geschäftsführer: Peer Heinlein -- Sitz: Berlin
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