Hello, We are using an A104 Sangoma card to tap an E1 and for an E1, this card provides IP interface (as configured). Data on E1 gets transferred to IP interface say Wireshark without even a single bit getting changed. Now this data is either a typical LAPD (HDLC format) or a proprietary Transparent frame (which carries in general TDM type of traffic).
So you can say there is no ICMP/UDP/TCP/SCTP/IP kind of DLT attached to traces. Regards, Gaurav -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Guy Harris Sent: Thursday, September 18, 2008 10:35 PM To: Developer support list for Wireshark Subject: Re: [Wireshark-dev] How to make libpcap/wiretap understand proprietry/standard link-layers On Sep 18, 2008, at 3:08 AM, Gaurav1 Jain wrote: > I want to understand how libpcap identifies a particular data link > layer? As indicated, this is more of a [EMAIL PROTECTED] question, as it's a libpcap question. > Currently we are tapping IP interfaces using WireShark where there > could be either HDLC or Transparent traffic without IP header > attached to it. "Without IP header attached to it"? Do you mean that there's no data link layer header *or* IP header, so that the packet begins with an ICMP/UDP/TCP/SCTP/etc. header? Or do you mean that there's no data link layer header but there *is* an IP header, so the packet begins with an IP header? I assume, from your other mail, that this is on Linux. Are those "interfaces" regular network interfaces (so that libpcap captures on them the same way it captures on, for example, Ethernet or 802.11 interfaces), or have you added a new interface type to libpcap? _______________________________________________ Wireshark-dev mailing list [email protected] https://wireshark.org/mailman/listinfo/wireshark-dev The information contained in this e-mail is private & confidential and may also be legally privileged. If you are not the intended recipient, please notify us, preferably by e-mail, and do not read, copy or disclose the contents of this message to anyone. _______________________________________________ Wireshark-dev mailing list [email protected] https://wireshark.org/mailman/listinfo/wireshark-dev
