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I am looking for .pcap file format of ATM.Its needed in my project.I am looking for mechanism so that ATM pcap file can be converted to Ethernet pcap file

Rajeev Das
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There's more than one link-layer header type for ATM. The list of link-layer header type values has both LINKTYPE_ATM_RFC1483/DLT_ATM_RFC1483, where the packets begin with an IEEE 802.2 header, and LINKTYPE_SUNATM/DLT_SUNATM, where the packets being with a SunATM header. There may be some other link-layer header types being used as well; you'll have to determine which of them the ATM pcap files you're looking at use.

  • First of all my concern is to capture pcap which contains ATM.How can i do that using wire-shark??Then I will be needing to convert that into Ethernet format. – Rajeev Das Apr 23 '13 at 09:06
  • What operating system is the machine on which you want to capture traffic running? –  Apr 23 '13 at 21:28
  • preferably on Windows7 or Ubuntu. – Rajeev Das Apr 25 '13 at 04:29
  • On Windows, WinPcap doesn't support ATM devices, so you won't be able to capture on Windows 7. On Ubuntu, it'll probably be `DLT_ATM_RFC1483`; to convert that to Ethernet, you'll have to write your own code that looks at the 802.2 LLC header and, if it's 802.2 + SNAP with an OUI of 0, creates a fake Ethernet header with the SNAP PID as the Ethertype and strips off the 802.2+SNAP header, and otherwise creates a fake Ethernet header with the appropriate length and puts the 802.2 LLC header and the rest of the packet after it. –  Apr 25 '13 at 20:01