Disable ipv4 fragmentation

["J HU" <judowold@hotmail.com>]

Dear experts,

I'm working with sockets in a debian with a version of kernel 2.6.x, and I'd 
like to disable the fragmentation of the ipv4 introduce.
I have read that there was the option of modified the file 
/proc/sys/net/ipv4/ip_always_defrag but it doesn't exist.
So I'm totally lost and I need to disable that fragmentation or change the 
size to the maximum of 65535.
Anyone can help me?

Thanks in advance!

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