tcpdump mailing list archives
Re: Pcap link type of InfiniBand
From: Guy Harris <guy () alum mit edu>
Date: Thu, 7 Jul 2016 00:22:04 -0700
On Jul 6, 2016, at 11:42 PM, Tal Attaly <talat () mellanox com> wrote:
I understand that LINKTYPE_ value just saves an id for the link type, but parsing code for InfiniBand is exist in wireshark - under ERF link type (Extensible Record File), so I wonder why not using the actual link type of InfiniBand.
LINKTYPE_ values are assigned numerically in order. LINKTYPE_ERF is 197. LINKTYPE_INFINIBAND is 247. I.e., at the time LINKTPE_ERF was assigned, LINKTYPE_INFINIBAND *did not exist*, so nobody *could* use it! LINKTYPE_ERF was requested by Endace (the creators of ERF) to allow all metadata from Endace DAG cards to be included in pcap captures. ERF files support multiple link-layer types, one of which is InfiniBand, as they had, at least at one point, hardware to capture InfiniBand traffic: http://www.endace.com/endace-delivers-single-device-solution-for-infiniband-data-capture-filter-and-analysis.html so LINKTYPE_ERF could be used for InfiniBand captures - and, in fact, if the capture was done with Endace's InfiniBand hardware, it's quite logical that it would have been used for the capture. _______________________________________________ tcpdump-workers mailing list tcpdump-workers () lists tcpdump org https://lists.sandelman.ca/mailman/listinfo/tcpdump-workers
Current thread:
- Pcap link type of InfiniBand Tal Attaly (Jul 06)
- Re: Pcap link type of InfiniBand Guy Harris (Jul 06)
- Re: Pcap link type of InfiniBand Guy Harris (Jul 06)
- Re: Pcap link type of InfiniBand Guy Harris (Jul 06)
- Re: Pcap link type of InfiniBand Tal Attaly (Jul 06)
- Re: Pcap link type of InfiniBand Guy Harris (Jul 07)
- Re: Pcap link type of InfiniBand Tal Attaly (Jul 06)
- Re: Pcap link type of InfiniBand Guy Harris (Jul 07)
- Re: Pcap link type of InfiniBand Guy Harris (Jul 06)