Different MTU for Send and Receive path

josh2

Team,

I want to tunnel UDP openvpn traffic over DNS tunnel.

I want to know is there any way to set different MTU for send and receive path.

i,e From client to server max MTU will be 250

and from Server to client max MTU will be 1400.

Thanks

josh2

Thanks Debbie,

right. I am planning to change following line fragment.c Line : 321

 f->outgoing_frag_size = optimal_fragment_size (buf->len, PAYLOAD_SIZE_DYNAMIC(frame));

I will keep all settings/config unchanged . Just for outgoing packet from client I will override max packet size to say 255 .
It means server will send data size max 1500 ..But client will send max 255 byte per packet. May be I need to change in some other places in code.
Can you please focus some light if I am going right.

But I am not sure if I will be able to build openvpn . I have been trying to build from source for last 1 month but still no luck 🙂

thanks

josh2

I am able to achieve what I wanted after changing few lines of code .

Now Server to client max packet size coming 1400 max.
and client to server packet size going 255 max .

Even today i am able to build openvpn in windows 7.
Now secure DNS tunnel is week away.

Thanks