The error message "pcap: network type 276 unknown or unsupported" typically occurs when an older version of attempts to read a packet capture file containing LINKTYPE_LINUX_SLL2 The Story of "Type 276"
Use editcap (from Wireshark):
Look for the line: "Link-layer header type: Unknown (276)" -pcap network type 276 unknown or unsupported-
If you encounter DLT 276 during an investigation:
Several possible causes could explain the existence of network type 276: The error message "pcap: network type 276 unknown
System: Ubuntu 22.04, libpcap 1.10.1, tshark 4.0.5
from scapy.all import rdpcap, wrpcap, Raw
pkts = rdpcap("in.pcap")
out = []
for p in pkts:
b = bytes(p)[4:]
out.append(Raw(b))
wrpcap("out.pcap", out)
If libpcap < 1.8.0, DLT 276 is likely unsupported. If libpcap < 1
The -pcap file format is a widely used standard for capturing and storing network traffic. However, there exists a mysterious network type, denoted as 276, which has been labeled as "unknown or unsupported-". This paper aims to investigate the nature of this enigmatic network type, exploring its origins, possible causes, and potential implications for network analysis and security.