Summary for 4.1.1 tcpdump release
      Fix build on systems with PF, such as FreeBSD and OpenBSD.
      Don't blow up if a zero-length link-layer address is passed to
        linkaddr_string().

Summary for 4.1.0 tcpdump release
      Fix printing of MAC addresses for VLAN frames with a length
        field
      Add some additional bounds checks and use the EXTRACT_ macros
        more
      Add a -b flag to print the AS number in BGP packets in ASDOT
        notation rather than ASPLAIN notation
      Add ICMPv6 RFC 5006 support
      Decode the access flags in NFS access requests
      Handle the new DLT_ for memory-mapped USB captures on Linux
      Make the default snapshot (-s) the maximum
      Print name of device (when -L is used)
      Support for OpenSolaris (and SXCE build 125 and later)
      Print new TCP flags
      Add support for RPL DIO
      Add support for TCP User Timeout (UTO)
      Add support for non-standard Ethertypes used by 3com PPPoE gear
      Add support for 802.11n and 802.11s
      Add support for Transparent Ethernet Bridge ethertype in GRE
      Add 4 byte AS support for BGP printer
      Add support for the MDT SAFI 66 BG printer
      Add basic IPv6 support to print-olsr
      Add USB printer
      Add printer for ForCES
      Handle frames with an FCS
      Handle 802.11n Control Wrapper, Block Acq Req and Block Ack frames
      Fix TCP sequence number printing
      Report 802.2 packets as 802.2 instead of 802.3
      Don't include -L/usr/lib in LDFLAGS
      On x86_64 Linux, look in lib64 directory too
      Lots of code clean ups
      Autoconf clean ups
      Update testcases to make output changes
      Fix compiling with/out smi (--with{,out}-smi)
      Fix compiling without IPv6 support (--disable-ipv6)