arp-scan
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Add support for Cisco ISL VLANs in addition to 802.1Q
arp-scan doesn't support Cisco's proprietary Inter-Switch Link (ISL) VLAN packet format - it only supports IEEE 802.1Q VLANs.
The ISL packet format is detailed here: https://www.cisco.com/c/en/us/support/docs/lan-switching/8021q/17056-741-4.html
This issue came from the old TODO file. I'm not sure if anyone cares about this, so if you think it would be useful please comment on this issue. Thanks.