Enormous: Em1, link-type EN10MB (Ethernet), capture size 1515 bytes. Em1: no IPv4 address assigned; use -v or -vv for full protocol decode. Em1 is listening to an ICMP6 multicast listener reportmax resp delay: 0. Embarrassing: Em1 (Em1) is listening on em1, linked to EN10 MB (Eethernet) and attached to a link to a single network.”]
Source: https://taosecurity.blogspot.com/2006/09/ifconfig-monitor-option.html