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Diffstat (limited to 'libnet/doc/RAWSOCKET_NON_SEQUITUR')
| -rw-r--r-- | libnet/doc/RAWSOCKET_NON_SEQUITUR | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/libnet/doc/RAWSOCKET_NON_SEQUITUR b/libnet/doc/RAWSOCKET_NON_SEQUITUR new file mode 100644 index 0000000..7f8c758 --- /dev/null +++ b/libnet/doc/RAWSOCKET_NON_SEQUITUR @@ -0,0 +1,41 @@ +=============================================================================== + $Id: RAWSOCKET_NON_SEQUITUR,v 1.2 2004/01/03 20:31:00 mike Exp $ + LIBNET 1.1 (c) 1998 - 2004 Mike D. Schiffman <mike@infonexus.com> + http://www.packetfactory.net/libnet +=============================================================================== + + Raw sockets are horribly non-standard across implementations. Here is + an incomplete list of some of the differences (corrections welcomed): + + Linux 2.2+: + + IP fragmentation: performed if packet is larger than MTU + IP checksum: always filled in + IP total length: always filled in + IP ID: filled in when zero + IP source address: filled in when zero + IP destination address: filled in when zero + Max packet size before kernel complains: 1500 bytes + + Solaris 2.6+: + + IP fragmentation bits: can't specify + IP fragmentation: performed if packet is larger than MTU + IP DF bit: always set + IP checksum: always filled in + Max packet size before kernel complains: ? + + OpenBSD 2.8+: + + IP fragmentation: performed if packet is larger than MTU + Max packet size before kernel complains: 8192 bytes + + Solaris, + for example, has terrible support for this packet interface. Older OpenBSD + versions and recent FreeBSD versions have the BSD_BYTE_SWAP issue where + the ip_len and ip_frag fields need to be in little endian order. Linux + apparently doesn't allow for the injection of broadcast IP datagrams. + Whenever complete control over the IP header is desired, use the link + layer API. + +EOF |