Re: [44net] Port-forwarding of 44-addresses

Hi I have acquired myself a problem. Recently I decided to move all web services away from the gateway to an ‘inner’ server. This is easily done by using port forwarding in the firewall on the gateway. Thus I forward all web services by using this line: iptables -t nat -A PREROUTING -p tcp -m multiport --dport $Services -d $EXT_IP -j DNAT --to $webserver where $Services is defined as Services="smtp,domain,www,https,submission,imaps", $EXT_IP is my external IP address and $webserver is the IP address of the ‘inner’ server. I do the same for the ampr interface: $iptables -t nat -A PREROUTING -p tcp -m multiport --dport $Services -i ampr0 -j DNAT --to $webserver In this case it is only the www and https services that are relevant since I do not do mail on the 44-address. All of this works of course as it should for ordinary IP addresses (non-44) and it also works fine when comming from a 44-address. Furthermore it works fine when I ping my 44-address from any IP address (which isn't surprising as ICMP is not forwarded). But it fails miserablywhen accessing my 44-address (44.145.40.3) from an ordinary IP address. The incomming request comes nicely in on the ampr interface, but the reply goes out the WAN interface to the Internet at largeand is thus not recognized as a reply on the originating host. I have spent quite a bit of time trying to findout why this is so. I’m convinced it is something in my setup that is the cause of this behavior, but I’m at a loss as what it may be, so I hope some of you eagle-eyed people out there can spot the error. Here are somedetails of my setup. Routing rules: $ip rule list 0: from all lookup local 44: from all to 44.0.0.0 /8 lookup ampr 45: from 44.145.40.3 lookup ampr 32766: from all lookup main 32767: from all lookup default Main routing table: $ip route list default via 86.48.99.33 dev enp0s7 metric 3 127.0.0.0/8 via 127.0.0.1 dev lo 192.168.19.0/24 dev enp0s6 proto kernel scope link src 192.168.19.6 ‘ampr’ routing table (table 44) (excerpts): $ip route list table ampr | head -n4 default via 169.228.34.84 dev ampr0 onlink 44.2.0.1 via 191.183.136.1 dev ampr0 proto 44 onlink window 840 44.2.2.0/24 via 216.218.207.198 dev ampr0 proto 44 onlink window 840 44.2.7.0/30 via 98.208.73.100 dev ampr0 proto 44 onlink window 840 My gateway is a Soekris Net5501 running Gentoo Linux updated to the latest versions last Monday. I do hope I have expressed myself clearly enough and provided details enough so that one of you can point at something and say: ‘there is your error’. If some information is missing or lacking please ask for it and I’ll provide as much as I can. Best 73 de Bent/OZ6BL _________________________________________ 44Net mailing list 44Net(a)mailman.ampr.org https://mailman.ampr.org/mailman/listinfo/44net