 | 1 | initial version |
This message means that 1) Wireshark is reading a capture from a pipe, rather than capturing on a network adapter and 2) whatever is writing to the pipe didn't write it in one of the standard Wireshark capture file formats, namely pcap and pcapng.
"Whatever is writing to the pipe" is presumably GNS3. There is at least one GNS3 issue about this - issue #2235.
