Hey everyone! I am running into a rather interesting issue and was hoping someone may be able to help. We are running a custom SNMP daemon on a server (its part of a vendor application). The servers are all multihomed, with one NIC on a service/public facing subnet, and the other NIC on a management subnet. We need all SNMP traffic to use the management subnet. We have set up 2 routing tables in IPROUTE2 to ensure all traffic goes out the interface that it comes in. It's tested, and everything is working except for SNMP. What happens with snmp is the snmp manager sends a request (for example, GET). The request is received by the SNMP daemon on the target server. The target server then generates a reply, but when it does, it uses the IP address of the service interface, not the management interface. We have reconfigured the application, but its still insisting on using that IP. The reply packet is then routed out the service interface because of the source IP. I have numerous packet traces verifying that this is the behavior. So what I need is the source IP address to be re-written from the service IP, to the management ip, so it can be routed out the correct interface. This ONLY needs to be done for snmp traffic, and it needs to be done prior to any routing. Is this possible? Any help would really be appreciated, this appears to be an application issue but we need to find a workaround until the vendor fixes it. Thank you everyone! -- To unsubscribe from this list: send the line "unsubscribe netfilter" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
