关于Wireshark中无法识别Yamux协议的技术咨询

Hey there! I totally get the frustration of hunting for a specific protocol in Wireshark and coming up empty-handed. Let's break down why you can't find Yamux and how to get it working properly:

First off, the core issue: Wireshark doesn’t include native support for the Yamux protocol by default—that’s exactly why you can’t spot it in the preferences menu or get it to decode packets automatically.

Here are the most reliable fixes to add Yamux decoding support:

1. Install a third-party Lua plugin #

Yamux is a community-supported protocol for Wireshark, so you’ll need a custom Lua script to enable its decoding:

• Find a well-maintained Yamux Wireshark Lua plugin (make sure it matches your Wireshark version to avoid compatibility bugs)
• Open Wireshark, go to Edit > Preferences > Protocols > Lua
  • Either add the path to your downloaded .lua file in the "Lua scripts" section, or move the script directly into Wireshark’s global plugins directory (varies by OS:
    • Windows: C:\Program Files\Wireshark\plugins
    • macOS: /Applications/Wireshark.app/Contents/Resources/share/wireshark/plugins
    • Linux: /usr/lib/wireshark/plugins
      )
• Restart Wireshark, and it should now detect and decode Yamux traffic

2. Manually assign protocol decoding (if needed) #

If you’ve installed the plugin but Wireshark still isn’t picking up the Yamux flow automatically:

• Right-click any packet from the suspected Yamux stream in the packet list
• Select Decode As > Locate the underlying transport protocol (usually TCP) in the "Current field" section
• From the "Protocol" dropdown, select Yamux (this option will only appear once the plugin is installed)
• Click OK to apply the decoding to the entire stream

3. Verify your captured traffic #

Before troubleshooting further, double-check that the traffic you're analyzing is actually Yamux:

• Open the packet details and switch to the hex view—Yamux uses a fixed 4-byte header with specific fields (version, type, flags, length) that you can cross-reference against the protocol spec to confirm

备注：内容来源于stack exchange，提问作者ray an