如何通过代码(在python中)找到网络的mtu值？

Question

我必须编写一个代码,我需要在python中使用udp协议发送数据.我需要将数据包大小设置为网络的MTU值.有什么方法可以决定在python中编写一些代码的网络的MTU值？

Answer 1

此答案来自 http://books.google.co.il/books?id=9HGUc8AO2xQC&pg=PA31&lpg=PA31&dq#v=onepage&q&f=false(th.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!'