On Thu, Apr 23, 2020 at 02:13:14PM +0200, David Balažic wrote: > Oh, i'm "lucky", shortly after starting "tcpdump -i eth1.3902 pppoed" > there was another disconnect: > > Thu Apr 23 11:44:13 2020 daemon.notice pppd[10756]: Modem hangup > > tcpdump output: > > listening on eth1.3902, link-type EN10MB (Ethernet), capture size 262144 bytes > 11:44:09.749322 PPPoE PADO [Service-Name] [AC-Name "SIMB_TABOR_BNG1"] > [Host-Uniq 0x44************long_number******************************AA] > [AC-Cookie ".5b************v"] > 11:44:09.754297 PPPoE PADS [ses 0x1] [Service-Name] [Host-Uniq > 0x44*******************long_number*********************************AA] > 11:44:13.115312 PPPoE PADT [ses 0x1] > 11:44:13.126422 PPPoE PADT [ses 0x1] [Host-Uniq 0x00002A04] [AC-Cookie > 0xED****************************75] > tcpdump: pcap_loop: The interface went down > 4 packets captured > 22 packets received by filter > 0 packets dropped by kernel > > > The ifconfig packet counter for the VLAN interface eth1.3902 is reset, > compare to values in quested message below, this is th eoutpu a few > minutes after the reconnect: > > eth1 Link encap:Ethernet HWaddr C4:3D:C7:90:CE:ED > inet6 addr: fe80::c63d:c7ff:fe90:ceed/64 Scope:Link > UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 > RX packets:24193753 errors:0 dropped:0 overruns:3 frame:0 > TX packets:12513809 errors:0 dropped:0 overruns:0 carrier:0 > collisions:0 txqueuelen:1000 > RX bytes:4171215264 (3.8 GiB) TX bytes:2485973 (2.3 MiB) > Interrupt:5 > > eth1.3902 Link encap:Ethernet HWaddr C4:3D:C7:90:CE:ED > inet6 addr: fe80::c63d:c7ff:fe90:ceed/64 Scope:Link > UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 > RX packets:255930 errors:0 dropped:0 overruns:0 frame:0 > TX packets:42015 errors:0 dropped:0 overruns:0 carrier:0 > collisions:0 txqueuelen:1000 > RX bytes:126494373 (120.6 MiB) TX bytes:25853728 (24.6 MiB) > You can monitor the evolution of you network devices with rtmon: $ rtmon file ./some/file.log link Then read it with ip monitor: $ ip monitor file ./some/file.log That should tell if eth1.3902 is ever passed down or even deleted.
