I’d like to know the available icmp-options. I can’t seem to find anything but any:any anywhere. I’d like to setup a rule to allow unlimited incoming echo responses to our router in order to ensure pppoe keepalive requests come back and connections aren’t dropped.
I’m under the notion that pppoe connections are being dropped when a customer is maxing out their queue. We use red to shape all customer’s incoming and outgoing bandwidth. Since ICMP is of TOS 0x0, it’s of the lowest priority.
I’ve performed various searches on here and found interesting information regarding the mss mangle rule for ensuring the mtu of new connections, along with the mtu/mru settings. Ours are 1480 and seem a tad higher than some of the other people on here using pppoe. Do mangle rules add to the overhead of pppoe? I’ve talked with the customer having problems and he’s completely dropped from the network and not just the web. THis is why I’m inclined to believe it’s keepalive related. Our keepalive is set at 10 or 2 seconds without a response and cya.
the icmp-options are described in ICMP RFC(s)
I guess these are them.