Hi I am an iptables beginner. I want to set up my firewall to rate limit incoming packets based on a particular source IP address (but not any other IP). I understand that there are dstlimit and hashlimit options for iptables. It is not clear to me whether these apply the same limit (x packets/sec) to each ip address (ie all IP addresses limited at x packets/sec) or whether their action can be applied to a single address (I suspect the former). If it is the latter, can the hashlimit switch be limited by (eg) -s? Alternatively can I jump past the rule for other ip addresses? Would either of these work? ... -A src_limit -s !<limit_ip> -j ACCEPT -A src_limit -m hashlimit --hashlimit 2/min --hashlimit-burst 10 --hashlimit-mode srcip,dstport --hashlimit-name per_src --hashlimit-htable-gcinterval 60000 --hashlimit-htable-expire 300000 -j ACCEPT ... or -A src_limit -s <limit_ip> -m hashlimit --hashlimit 2/min --hashlimit-burst 10 --hashlimit-mode srcip,dstport --hashlimit-name per_src --hashlimit-htable-gcinterval 60000 --hashlimit-htable-expire 300000 -j ACCEPT Thanks Brendan
