-pcap Network Type 276 Unknown Or Unsupported- Jun 2026

Check with:

The file was written incorrectly. A bug in a custom capture script set the DLT field to 0x0114 (276 decimal) when it should have been 105 (802.11) or 1 (Ethernet). This can happen with: -pcap network type 276 unknown or unsupported-

A security team was auditing a fleet of medical IoT devices (insulin pumps) that communicated via 802.15.4 (ZigBee). They captured traffic using a dedicated USB dongle which wrote pcap files with DLT 276 (mapped to DLT_IEEE802_15_4_TAP ). When they transferred the file to their central Linux analysis server (running RHEL 7 with an older libpcap), they received the error: Check with: The file was written incorrectly

If you cannot update your analysis environment immediately, try capturing on a specific interface ) instead of the "any" interface ( ), as this may avoid the SLL2 header entirely. Why this happens in Kubernetes Tools like They captured traffic using a dedicated USB dongle

Or perhaps a variant: pcap_open_offline: network type 276 unknown or unsupported