I have a customer who ran into a situation the other day where one of their websites was down because it was receiving too many http POST requests, the POST requests filled the queue on their server and was timing out for other clients. Is there a way i am able to set up the asa so it will restrict how many connections are allowed per second/minute from one ip? Thanks in advance!
Let me start of by saying that I have not played around with these settings that many times myself. I have usually set connection timeout values for certain connections more than use connection limits
Wonder if something along these lines would work
access-list WEB-SERVER-CONNECTIONLIMIT extended permit tcp any host eq www
access-list WEB-SERVER-CONNECTIONLIMIT extended permit tcp any host https
match access-list WEB-SERVER-CONNECTIONLIMIT
set connection per-client-max per-client-embryonic-max
I am not sure but to my understanding the destination IP address you use in the ACL depends on your software. I am using 8.4(5) so I actually used the local IP address as the destination of the ACL even though the host was Static NATed to a public IP address
Yes, to my understanding the first one sets the connection limit for one source IP address.
As I said I have not used this configuration that much myself. But as the embryonic connection refers to a connection that hasn't fully formed then I would imagine this would not need to be very high value since there should not be that many connections from a single source IP address that have not fully formed. If there were it would most likely be a situation where the client was only sending TCP SYN to the target server with the intention to disrupt the server operation.
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