root@OpenWrt:~# tcpdump -i eth0.2
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0.2, link-type EN10MB (Ethernet), capture size 262144 bytes
19:00:03.715003 PPPoE PADI [Service-Name] [Host-Uniq 0x000013E1]
19:00:03.719579 PPPoE PADO [Host-Uniq 0x000013E1] [
AC-Name "pun-ras-bng-mhs-XXX"] [Service-Name "cnt.bsnl.in"] [Service-Name "operation.in"]...
19:00:03.719702 PPPoE PADR [Service-Name] [Host-Uniq 0x000013E1]
19:00:04.105200 PPPoE PADS [ses 0x1a75] [Service-Name] [Host-Uniq 0x000013E1] [AC-Name "pun-ras-bng-mhs-XXX"]
19:00:04.119100 PPPoE [ses 0x1a75] LCP, Conf-Request (0x01), id 1, length 16
19:00:04.314031 PPPoE [ses 0x1a75] LCP, Conf-Request (0x01), id 247, length 21
19:00:04.314150 PPPoE [ses 0x1a75] LCP, Conf-Nack (0x03), id 1, length 10
19:00:04.314387 PPPoE [ses 0x1a75] LCP, Conf-Ack (0x02), id 247, length 21
19:00:04.314504 PPPoE [ses 0x1a75] LCP, Conf-Request (0x01), id 2, length 16
19:00:04.318448 PPPoE [ses 0x1a75] LCP, Conf-Ack (0x02), id 2, length 16
19:00:04.318493 PPPoE [ses 0x1a75] CHAP, Challenge (0x01), id 1, Value <>, Name pun-ras-bng-mhs-02
19:00:04.318762 PPPoE [ses 0x1a75] LCP,
Echo-Request (0x09), id 0, length 10
19:00:04.318905 PPPoE [ses 0x1a75] CHAP, Response (0x02), id 1, Value <>, Name <username>@ftth.bsnl.in
19:00:04.320722 PPPoE [ses 0x1a75] LCP, Echo-Reply (0x0a), id 0, length 10
19:00:04.544599 PPPoE [ses 0x1a75] CHAP, Fail (0x04), id 1, Msg Account is not active
19:00:04.544889 PPPoE [ses 0x1a75] LCP, Term-Request (0x05), id 248, length 6
19:00:04.544979 PPPoE [ses 0x1a75] LCP, Term-Request (0x05), id 3, length 46
19:00:04.545088 PPPoE [ses 0x1a75] LCP, Term-Ack (0x06), id 248, length 6
19:00:04.548063 PPPoE [ses 0x1a75] LCP, Term-Ack (0x06), id 3, length 6
19:00:04.551164 PPPoE PADT [ses 0x1a75] [Host-Uniq 0x000013E1]
tcpdump: pcap_loop: The interface went down