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Pcap: network type 261 unknown or unsupported

According to the official list of pcap/pcapng link-layer type values, 261 is LINKTYPE_ZWAVE_R1_R2, defined as "Z-Wave RF profile R1 and R2 packets, as specified by ITU-T Recommendation G.9959, with some MAC layer fields moved." According to the Wikipedia, Z-Wave is "a wireless communications protocol used primarily for home automation".

If that's what you're capturing, no current version of Wireshark supports that.

If that's not what you're capturing, please tell the IXIA people to stop using a link-layer type value of 261 for something other than Z-Wave RF profile R1 and R2 packets.

IXIA is using Wireshark 2.4.9-IxV7.5_1.30

Wireshark is software governed by the GNU General Public License, version 2. This means that 1) if you ask them for the source code used to generate Wireshark 2.4.9-ixV7.5_1.30, they MUST supply it to you and 2) you may then give that source code to anybody you want to, including the Wireshark developers, to try to add its capabilities to Wireshark.