Method Detail

• getMTU

  public static int getMTU(InetAddress ia,
                           boolean isSSU2)

  The MTU for the socket interface, if available. Not available for Java 5. Note that we don't return the value for the default interface if we can't find the address. Finding the default interface is hard, altough we could perhaps just look for the first non-loopback address. But the MTU of the default route probably isn't relevant. For SSU2 MTU, values lower than PeerState2.MIN_MTU may be returned, so the caller can determine if SSU2 should be supported.

  Parameters:

  ia - null ok

  isSSU2 - if true, calculate SSU2 MTU

  Returns:

  0 if Java 5, or if not bound to an address; limited to range MIN_MTU to LARGE_MTU for SSU 1.

• main

  public static void main(String[] args)

  CLI test

• rectify

  public static int rectify(boolean isIPv6,
                            int mtu)

  Rectify the MTU value to valid range and alignment.

  Parameters:

  isIPv6 - true if IPv6

  mtu - the MTU value to rectify

  Returns:

  min of PeerState.MIN_MTU, max of PeerState.LARGE_MTU, rectified so rv % 16 == 12 (IPv4) or rv % 16 == 0 (IPv6)