Upgrade tools / libraries
The error -pcap network type 276 unknown or unsupported- is a frustrating but surmountable obstacle. It signals a mismatch between your capture tool’s expectations and your analyzer’s capabilities—not a corrupted file or a hopeless situation.
: Some users have found success processing these files through TraceWrangler to convert or "clean" headers into a more compatible Ethernet format .
For example, if you know the packets are actually raw Ethernet (Type 1):
Our analysis revealed that network type 276 appears to be related to a specific, custom network protocol. The protocol seems to be a variation of a known protocol, with modifications that are not publicly documented.