Deferred Accept
Hi, I wonder what statement form online help exactly means in relation to packet flow on BIG-IP (based on this image): Specifies, when checked (enabled), that the system defers allocation of the connection chain context until the system has received the payload from the client. When monitoring session table as well as tcp profile stats (after 3WHS finished but before first data packet send) only difference is in tcp profile stats: Deferred Accept enabled: show sys connection cs-client-addr 10.128.11.3 output: 10.128.11.3:12346 10.128.11.51:80 any6.any any6.any tcp 19 (tmm: 2) none show ltm profile tcp [profile used by VS] output: Open 1, Accepted 1 Deferred disbaled show sys connection cs-client-addr 10.128.11.3 output: as above show ltm profile tcp [profile used by VS] output: Open 0, Accepted 0 So in both cases entry in session table is created - what part then is deferred? What exactly is connection chain context? PiotrTCP profile stats for client and server context
Hi, Just did some test on VS without oneconnect and separate client and server TCP profile. I wonder what exactly means Open, Accepted and Established depending on context. Stats for client context profile: Connections Open 1 Current in CLOSE-WAIT/LAST-ACK 0 Current in FIN-WAIT-1/CLOSING 0 Current in FIN-WAIT-2 0 Current in TIME-WAIT 0 Accepted 1 Not Accepted 0 Established 0 Failed 0 Expired 0 Abandoned 0 server context: Connections Open 1 Current in CLOSE-WAIT/LAST-ACK 0 Current in FIN-WAIT-1/CLOSING 0 Current in FIN-WAIT-2 0 Current in TIME-WAIT 0 Accepted 0 Not Accepted 0 Established 1 Failed 0 Expired 0 Abandoned 0 For session table entries: Sys::Connections 10.128.11.3:12346 10.128.11.51:80 10.1.20.100:12346 10.1.20.11:80 tcp 29 (tmm: 2) none Total records returned: 1 Sys::Connections 10.128.11.3:12346 10.128.11.51:80 10.1.20.100:12346 10.1.20.11:80 tcp 29 (tmm: 2) None Why for: Client context Open and Accepted is reported Server context Open and Established is reported Accepted means only 3WHS performed in client context, never in server context? Established can be only for successful 3WHS between BIG-IP and member in server context, never in client context? Or only when there there are matching client and server flows in session table? PiotrF5 Ltm V14.1 & Nginx Session Table Stuck Problem (even after poweroff both test vms sessions are still there)
I faced a problem with especially 14.1 and nginx 1.14.0-0ubuntu1.2 Test Setup I have is set accordingly; Vmware Workstation 15 (Lan segmentation choose and vlan setup on ubuntus and F5) F5 V14.1 Vm edition Flow is ; Client VLAN ------ F5 ----- Server VLAN Client vlan there is test vm ubuntu 18.04.2 and server vlan there is another test vm ubuntu 18.04.2 When I test sytem with serverside installed with nginx 1.14.0-0ubuntu1.2 and setted everything default test page. and set F5 with all default values as node, pool, vserver http vserver all works normally.But the big thing is F5 never closes connection session table whatsoever when backend is nginx 1.14.0-0ubuntu1.2 version when i purge nginx and install apache2 this behaviour never occurs. I dont know if its F5 connection handling or nginx out of standart approach on tcp stack. Apache benchmark tool i use enough to fill the session table entries easily since never expires (no conn limit on vserver all default) $ ab -n 5000 -c 50 http://20.0.0.10/ After this command finished i try to request the vserver ip again and always gives can not establish connection. When i try curl via locally inside F5 device vserver is working. But not over network. When i check session table in F5; These entries below all i see even the client and server machines are powered down. F5's session table is still with those and incrementing the timeout values even i set the timeout to 30 seconds. 20.0.0.200:50862 20.0.0.10:80 any6.any any6.any tcp 255 (tmm: 1) none none 20.0.0.200:60550 20.0.0.10:80 any6.any any6.any tcp 254 (tmm: 1) none none 20.0.0.200:44070 20.0.0.10:80 any6.any any6.any tcp 253 (tmm: 1) none none Last work i had done on 12.x i have no issue with nginx this version. There is something not right Between nginx and F5 need to check more. Please write if anyone face such issue as i doo. For fast solution i try to clear sessions since you can not delete them when tried. Only option to restart device or bigstart restart I dont know if its a known bug. Please guide me to url if its i could not able to find info regarding. Thanks
