How to configure the size of OVPN socket buffers larger than 256K?

[RulerV]

I use the last release of Merlin firmware at ASUS hardware (a few different routers).


I’m trying to setting up the size of OVPN socket buffers 512K but I can’t do that. I’ve tried to put the corresponding instructions to the configuration file either of server or client but always receive the size of buffers 256K.

Dec  1 13:52:03 ovpn-client1[8912]: PUSH: Received control message: 'PUSH_REPLY,route 192.168.100.0 255.255.255.0 vpn_gateway 500,sndbuf 524288,rcvbuf 524288,route-gateway 192.168.3.1,topology subnet,ping 5,ping-restart 15,ifconfig 192.168.3.2 255.255.255.0,peer-id 0,cipher AES-128-GCM'
Dec  1 13:52:03 ovpn-client1[8912]: OPTIONS IMPORT: timers and/or timeouts modified
Dec  1 13:52:03 ovpn-client1[8912]: OPTIONS IMPORT: --sndbuf/--rcvbuf options modified
Dec  1 13:52:03 ovpn-client1[8912]: Socket Buffers: R=[245760->245760] S=[245760->245760]

May be I have to configure an other system variables for accepting the buffer size greater than 256K?

 

[RulerV]

I’d like to anwer for my question by myself. We have to properly changed
/proc/sys/net/core/rmem_max and
/proc/sys/net/core/wmem_max variables. But firmware allow us to settings value twice much than allowed by variables