Virtual Server / Port Forwarding - Protocol = "Other"

[orion44]

What exactly does OTHER do? Forward all ports? Does it change "Port Range/Local Port" to IP protocol number instead so I could forward ICMP/GRE/SCTP traffic instead? Unlikely, but still confused what this actually does.

 

[RMerlin]

View attachment 10671

What exactly does OTHER do? Forward all ports? Does it change "Port Range/Local Port" to IP protocol number instead so I could forward ICMP/GRE/SCTP traffic instead? Unlikely, but still confused what this actually does.

That's correct, the port field then becomes a protocol number field.

// Handle raw protocol in port field, no val1:val2 allowed
if (strcmp(proto, "OTHER") == 0) {
     protono = strsep(&c, ":");
     fprintf(fp, "-A %s %s -p %s -j DNAT --to %s\n", chain, srcips, protono, dstip);

Linksys used to be even more confusing: setting it to BOTH would allow you to use it to forward protocol 47 (GRE) when forwarding to a local PPTP server.

 

[orion44]

Wow I was only kidding, can't believe that's actually what it does. Thanks for explaining!