Maximum number of TCP connections to LTM - is there a limit?
Hello, I am wondering if there is any system level restriction on the maximum number of TCP connections that can be opened to an LTM version 10.2.4 and 11.5.2. Is the limit determined by the system memory or are there any other constraints?
Setting connection limit(call limit) to nodes while load balancing sip traffic over UDP
I have the following setup. SIP call is distributed from SBC to F5 LTM over UDP. Created a SIP persistence profile in LTM using call id as persistence key. Calls are being distributed to all nodes in the round robin and SIP messages are getting persisted. My requirement is to load balance the calls to the least active call node and limit the number of active calls to each node. i.e Nodes shall take only x number of active calls at any time. Active call is a call to which BYE is not received yet. Tried setting connection limit to each node but number of connections is always 1 on the statistics page. The connection limit is always 1 as in my case SIP is over UDP, source and destination IP & Port will be same for all calls. Is there any way in F5 LTM where we can limit the number of calls to each node and load balance the calls to the least call-taking node for SIP over UDP?
Using data group for limiting the concurrent client connections from different subnets
Hi All, We have recently deployed F5 in our environment. We are running 11.5.3 version. We are trying to set up rule to limit the concurrent connections from a source IP to a particular value. After testing varios snippets, the best one worked for us was (https://devcentral.f5.com/tech-tips/articles/iruleology-connection-limiting-take-2): when CLIENT_ACCEPTED { set tbl "connlimit:[IP::client_addr]" set key "[TCP::client_port]" table set -subtable $tbl $key "ignored" 180 if { [table keys -subtable $tbl -count] > 46 } { table delete -subtable $tbl $key event CLIENT_CLOSED disable reject } else { here the timer value is in ms ; 60000 ms (60 sec) set timer [after 60000 -periodic { table lookup -subtable $tbl $key }] } } However, when I start like 60 parallel concurrent connections it allows like 42 (or something) slight less than the set value. But then if I again try to make the connections (when pref connections are active) it does eventually limits me to 46 (total). This is probably an expected behavior , and we will see some %age of error? My concern is to Limit the connections per subnets, hosts. As I was browsing through, data group can help me to achieve that. So, I created an address data group "connlimit_dg" with address records in the GUI: Address Records: 192.0.0.0/255.0.0.0 := 22 10.0.0.0/255.0.0.0 :=22 I see like '1' or sometimes none connection allowed to my test host (everything else is refused). I am suspecting I am not referring to the data group correctly. See the snippet: when CLIENT_ACCEPTED { Max connections per client IP set limit [class match [IP::client_addr] equals "connlimit_dg"] Set a subtable name with a standard prefix and the client IP set tbl "connlimit:[IP::client_addr]" Use a key of the client IP:port set key "[IP::client_addr][TCP::client_port]" table set -subtable $tbl $key "ignored" 180 if { [table keys -subtable $tbl -count] > $limit} { table delete -subtable $tbl $key event CLIENT_CLOSED disable reject } else { here the timer value is in ms ; 60000 ms (60 sec) set timer [after 60000 -periodic { table lookup -subtable $tbl $key }] } } when CLIENT_CLOSED { after cancel $timer table delete -subtable $tbl $key } Thanks! Regards RenukaCLI F5 - Change the Connection Limit in list of Nodes
I have 100 nodes that i want to change the Connection Limit of every node to 10 with list like Node1 Connection Limit 10 Node2 Connection Limit 10 Node3 Connection Limit 10 Node4 Connection Limit 10 Node5 Connection Limit 10 Node6 Connection Limit 10 Node7 Connection Limit 10 like this... thenx!!!
How to mitigate Connection limit interfering with Existing session
Hi I want to use connection limit to limit connection to pool member But I have some question for when Existing client perform transaction. If connection limit is reached and then Existing client try to submit transaction. It will break application or F5 just send RST to client, At least it will redirect to fallback host if any. Am I correct? Is there a way to mitigate this problem and ensure Existing client continue using normally Thank you
