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Your current build of the tool was compiled without support for certain IBM-specific protocols.
You are using an older version of Wireshark or tcpdump that predates the addition of the SCLP link type.
You captured traffic on an IBM Z system and moved it to a Windows or Linux workstation for analysis, but the workstation's tools aren't equipped for mainframe-specific headers. How to Fix the Error 1. Update Wireshark / Libpcap
The error isn't a sign of a broken file, but rather a compatibility gap between IBM Mainframe protocols and standard networking tools. Updating your software to the latest version is the 90% solution. If you are working in a specialized enterprise environment, you may need to consult IBM-specific documentation for the appropriate dissector plugins.
The simplest solution is often the most effective. Link Type 276 support has been added to more recent versions of the libpcap library and Wireshark.
If you only need to look at the payload and don't care about the SCLP headers, you can try converting the file using editcap (a command-line tool bundled with Wireshark).
Your current build of the tool was compiled without support for certain IBM-specific protocols.
You are using an older version of Wireshark or tcpdump that predates the addition of the SCLP link type.
You captured traffic on an IBM Z system and moved it to a Windows or Linux workstation for analysis, but the workstation's tools aren't equipped for mainframe-specific headers. How to Fix the Error 1. Update Wireshark / Libpcap
The error isn't a sign of a broken file, but rather a compatibility gap between IBM Mainframe protocols and standard networking tools. Updating your software to the latest version is the 90% solution. If you are working in a specialized enterprise environment, you may need to consult IBM-specific documentation for the appropriate dissector plugins.
The simplest solution is often the most effective. Link Type 276 support has been added to more recent versions of the libpcap library and Wireshark.
If you only need to look at the payload and don't care about the SCLP headers, you can try converting the file using editcap (a command-line tool bundled with Wireshark).
