RTSP and related_server rule

Hello,

 

 

I need to get working the scheme described below.

 

 

I have the following scheme:

 

[Internal RTSP-Sources] - [RTSP Servers Pool] - [BigIP F5] - [SNAT] - {Internet} - [ External RTSP- Source ]

 

|

 

\ {RTSP Clients}

 

 

I have setuped static mapping of rtsp url to an external rtsp source on my rtsp-servers.

 

 

When RTSP client is connecting to an external VIP and requesting this static url then BigIP forwards request to a server from RTSP Servers pool, and then server is staring to connect to an external rtsp-source.

 

 

When RTSP session from rtsp-server is started and when all of the SETUP's and DESCRIBES are done, then external source is starting a stream of udp-flow to BigIP BIP, but f5 is droping this udp flow as non-related traffic.

 

 

I've searched for the decision for this issue, and have found the "relate_server" command, which setups a related established connection in a connection-table.

 

 

I wrote the following iRule for this issue:

 

when SERVER_CONNECTED {

 

 

log "Test_iRule2 connection from[IP::client_addr]:[TCP::client_port]. \

 

Mapped to [serverside {IP::local_addr}]:[serverside {TCP::local_port}] \

 

-> [IP::server_addr]:[serverside {TCP::remote_port}]"

 

}

 

 

when RTSP_RESPONSE {

 

if { [RTSP::header exists "Transport"] } {

 

set transport [RTSP::header value "Transport"]

 

log local0. "0.1 $transport"

 

 

set ::client_addr [IP::client_addr]

 

set ::server_addr [IP::server_addr]

 

set ::snat_addr [IP::local_addr]

 

set ::client_port [findstr $transport "client_port=" 12 ";"]

 

set ::server_port [findstr $transport "server_port=" 12 ";"]

 

log local0. "$::snat_addr $::server_addr $::client_addr

 

$::client_port $::server_port"

 

 

relate_server {

 

proto 17

 

clientflow external $::snat_addr $::client_port $::server_addr $::server_port

 

serverflow internal $::client_addr $::client_port $::server_addr $::server_port

 

}

 

 

unset ::client_addr

 

unset ::server_addr

 

unset ::snat_addr

 

unset ::client_port

 

unset ::server_port

 

 

}

 

 

}