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The same issue on rhel-6.

# rpm -q wireshark
wireshark-1.8.10-17.el6.x86_64

# tshark -r tlsv1.0-dhe-rsa.pcapng -V 'ssl.handshake.extension.type == 0x0016' | grep 'Extension: Encrypt then MAC'


# tshark -r tlsv1.0-dhe-rsa.pcapng -V 'ssl.handshake.extension.type == 0x0016' | grep 'Extension: Unknown 22'
            Extension: Unknown 22
            Extension: Unknown 22

+++ This bug was initially created as a clone of Bug #1222901 +++

Description of problem:
If the client or server contain extension of type 0x0016 (22), they are reported as "Unknown".

Version-Release number of selected component (if applicable):
wireshark-1.10.3-12.el7_0.x86_64

How reproducible:
Always

Steps to Reproduce:
1. load tlsv1.0-dhe-rsa.pcapng
2. Inspect Client Hello and Server Hello messages

Actual results:
Extension is marked as "Unknown"

Expected results:
Extension is recognised as "Encrypt then MAC"

Additional info:

*** This bug has been marked as a duplicate of bug 1222902 ***