How to find mtu value of network through code(in python)?

python sockets mtu
Rahul Katare picture Rahul Katare · Dec 23, 2012 · Viewed 7.7k times · Source

I have to write a code where I need to send data using udp protocol in python. I need to set the packet size to the MTU value of the network. Is there any way that I can decide the MTU value of the network writing some code in python?

Answer

hillel_guy picture hillel_guy · Dec 23, 2012

This answer was taken from http://books.google.co.il/books?id=9HGUc8AO2xQC&pg=PA31&lpg=PA31&dq#v=onepage&q&f=false (page 31)

s = socket.socket(socket.AF_INET,socket.SOCK_DGRAM)
hostName = #ip here
Port = 9999
s.connect((hostName, Port))
s.setsockopt(socket.IPPROTO_IP, IN.IP_MTU_DISCOVER, IN.IP_PMTUDISC_DO)
try:
    s.send('#' * 1473)
except socket.error:
    print 'The message did not make it'
    option = getattr(IN, 'IP_MTU', 14)
    print 'MTU:', s.getsockopt(socket.IPPROTO_IP, option)
else:
    print 'The big message was sent! Your network supports really big packets!'

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