root@modemtim:~# ifup voip2 && sleep 10 && ifdown voip2
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on voipptm0, link-type EN10MB (Ethernet), capture size 262144 bytes
23:42:51.790434 e4:8f:34:3a:04:24 (oui Unknown) > Broadcast, ethertype PPPoE D (0x8863), length 24: PPPoE PADI [Service-Name]
23:42:51.803034 e0:24:7f:fa:4e:04 (oui Unknown) > e4:8f:34:3a:04:24 (oui Unknown), ethertype PPPoE D (0x8863), length 56: PPPoE PADO [Service-Name] [AC-Name "RMBNG016"]
23:42:51.806494 e4:8f:34:3a:04:24 (oui Unknown) > e0:24:7f:fa:4e:04 (oui Unknown), ethertype PPPoE D (0x8863), length 24: PPPoE PADR [Service-Name]
23:42:51.818725 e0:24:7f:fa:4e:04 (oui Unknown) > e4:8f:34:3a:04:24 (oui Unknown), ethertype PPPoE D (0x8863), length 56: PPPoE PADS [ses 0xd3f] [Service-Name]
23:42:51.998721 e0:24:7f:fa:4e:04 (oui Unknown) > e4:8f:34:3a:04:24 (oui Unknown), ethertype PPPoE D (0x8863), length 59: PPPoE PAD-d3 [ses 0xd3f] [TAG-0x112 "ntp1=91.80.35.171,ntp2=91.80.35.139"]
root@modemtim:~# 23:43:01.880533 e4:8f:34:3a:04:24 (oui Unknown) > e0:24:7f:fa:4e:04 (oui Unknown), ethertype PPPoE D (0x8863), length 20: PPPoE PADT [ses 0xd3f]
23:43:01.894451 e0:24:7f:fa:4e:04 (oui Unknown) > e4:8f:34:3a:04:24 (oui Unknown), ethertype PPPoE D (0x8863), length 56: PPPoE PADT [ses 0xd3f]
tcpdump: pcap_loop: The interface went down
7 packets captured
7 packets received by filter
0 packets dropped by kernel