Date: Mon, 22 Sep 1997 16:46:43 -0500 (CDT) From: Mark Tinguely <tinguely@plains.NoDak.edu> To: freebsd-atm@freebsd.org Cc: ylim@netstar.com Subject: atmdump correction Message-ID: <199709222146.QAA24799@plains.NoDak.edu>
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On Sep 10, 1997, I said: > As a NDSU Graduate Student, Yen Yen Lim (http://www.cs.ndsu.NoDak.edu/~lim/ > and mailto:ylim@netstar.com), made some changes to BPF/TCPDUMP to trace > incoming/outgoing ATM packets. > > Since I had not chosen a ATM stack for my FreeBSD driver until she was nearly > defending her thesis, the code that parses and prints ATM PDUs is based > on LANE (which she tested on a Solaris machine using the Sun ATM cards). > Hopefully, I can add the IETF's IP over ATM information into the atmdump > in the near future. I was wrong, Yen Yen did implement parsing/printing for IETF's Classical IP over ATM, and not LANE parsing/printing as I stated earlier. I changed her printing routines to use the standard tcpdump IP (TCP, UDP, ICMP) printing routine because it give much more details on the packet. I also change to code to support point to point IETF's Classical IP over ATM (basically ignoring the missing LLC header). I fixed the raw cell BPF tracing in the nicstar driver (I had the old cell header order in the passing of BPF header). There is another error in the NICStAR card that causes the reception of Payload types to be wrong in certain cases: Send a payload type of 1, 4 or 6 and the last cell of the transmission will be sent/received as type 2, 5, or 7 respectively. I am stilling thinking of changing the BPF pseudo-header on the driver/atmdump to include: 1) AAL (BPF can filter on this field) 2) Encoding type (LANE, IETF IP over ATM, NATIVE ATM, etc) future atmdump support for: 1) the atmdump now needs LANE parsing/printing support. 2) better native ATM the nicstar code ftp://ftp.cs.ndsu.NoDak.edu/pub/freebsd/atm/nicstar.tgz the atmdump ftp://ftp.cs.ndsu.NoDak.edu/pub/freebsd/atm/atm-bpf.tgz
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