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  • 通过UDP探测端到端MTU

    P_MTU_D(Path MTU Discovery)

    socket的UDP功能,去发现端到端MTU

    #!/usr/bin/env python3
    #-*- encoding:utf8 -*-
    #Used UDP to learn the MTU of the end_to_end PATH_MTU
    
    import IN,argparse,socket
    
    if not hasattr(IN,'IP_MTU'):
        raise RuntimeError('cannot perform MTU discovery on this combination')
    
    def send_big_datagram(host,port):
        sock = socket.socket(socket.AF_INET,socket.SOCK_DGRAM)
        sock.setsockopt(socket.IPPROTO_IP,IN.IP_MTU_DISCOVER,IN.IP_PMTUDISC_DO)
        sock.connect((host,port))
        try:
            sock.send(b'#'*65535)
        except socket.error:
            print("also,the datagram did not make it")
            max_mtu = sock.getsockopt(socket.IPPROTO_IP,IN.IP_MTU)
            print('Actual MTU:{}'.format(max_mtu))
    
    if __name__ == '__main__':
        parser = argparse.ArgumentParser(description='Send UDP Packet to Get PATH_MTU')
        parser.add_argument('host',help='the target host')
        parser.add_argument('-p',metavar='port',type=int,default=1060,help='UDP port((default 1060)')
        args = parser.parse_args()
        send_big_datagram(args.host,args.p)
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  • 原文地址:https://www.cnblogs.com/alben-cisco/p/7072158.html
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