# figure out interface mac address t42:/home/dpavlin# ip link show eth0 2: eth0: mtu 1500 qdisc pfifo_fast state UP mode DEFAULT group default qlen 1000 link/ether 00:0d:60:79:26:67 brd ff:ff:ff:ff:ff:ff t42:/home/dpavlin# ip link show eth2 4: eth2: mtu 1500 qdisc pfifo_fast state UNKNOWN mode DEFAULT group default qlen 1000 link/ether 00:e0:4c:39:00:78 brd ff:ff:ff:ff:ff:ff # make sure that mac tables in switches are populated (ping something available in that vlan) t42:/home/dpavlin# arping -S 10.20.30.77 -i eth0 10.4.0.1 t42:/home/dpavlin# arping -S 10.20.30.78 -i eth2 193.198.212.1 # pull new bridge tables from switches dpavlin@black:~/dell-switch$ ./sw-mac-port.sh # pull all switches or you can just pull few interesting ones which is faster: dpavlin@black:~/dell-switch$ ./snmp-mac-port sw-e300 dpavlin@black:~/dell-switch$ ./snmp-mac-port sw-e300-2 # find switch and port for mac dpavlin@black:~/dell-switch$ ./find-port-for-mac 00:0d:60:79:26:67 # t42 eth0 sw-e300 4 00:0d:60:79:26:67 17 # mac 00:0d:60:79:26:67 on 19 switches dpavlin@black:~/dell-switch$ ./find-port-for-mac 00:e0:4c:39:00:78 # t42 eth2 sw-e300 1 00:e0:4c:39:00:78 23 sw-e300-2 1 00:e0:4c:39:00:78 21 # mac 00:e0:4c:39:00:78 on 42 switches # repeat all that again for eeepy dpavlin@eeepy:~$ ip link show eth0 2: eth0: mtu 1500 qdisc pfifo_fast state UP mode DEFAULT group default qlen 1000 link/ether 00:1e:8c:0a:49:3c brd ff:ff:ff:ff:ff:ff dpavlin@eeepy:~$ sudo arping -i eth0 -S 10.20.30.55 193.198.212.1 dpavlin@black:~/dell-switch$ ./find-port-for-mac 00:1e:8c:0a:49:3c # eeepy eth0 sw-a200-s 1 00:1e:8c:0a:49:3c 17 # mac 00:1e:8c:0a:49:3c on 43 switches # figure out which vlans are on which switches dpavlin@black:~/dell-switch$ ./vlan-ports.pl ./log/*sw-{e300,a200-s}*vlan* 2>/dev/null ----------- ----- 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16{17}18 19 20 21 22 23 24 sw-a200-s 1 X X X X X X X X X X X X X X X X e0 X X X X X . X eeepy eth0 sw-a200-s 4 . . . . . . . . . . . . . . . . . . . . . . X X sw-a200-s 5 . . . . . . . . . . . . . . . . . . . . . . X X sw-a200-s 20 . . . . . . . . . . . . . . . . . . . . . . X X ----------- ----- 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16{17}18 19 20 21 22 23 24 sw-e300 1 X X X X X X X X X X X X X X X X . X X X X . X X sw-e300 4 . . . . . . . . . . . . . . . . t0 . . . . X . X t42 eth0 sw-e300 5 . . . . . . . . . . . . . . . . . . . . . X . X sw-e300 20 . . . . . . . . . . . . . . . . . . . . . X X X ----------- ----- 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20{21}22 23 24 sw-e300-2 1 X X X X X X X X X X X X X X X X X X X X t2 X X X th42 eth2 sw-e300-2 20 . . . . . . . . . . . . . . . . . . . . . . . X # wierd frames eeepy:/home/dpavlin# uname -a Linux eeepy 3.16.0-4-586 #1 Debian 3.16.51-2 (2017-12-03) i686 GNU/Linux eeepy:/home/dpavlin# tshark -i eth0 | grep 'frame' Capturing on 'eth0' 1 0.000000 00.00.00 -> 80.00.00 FC 86 Unknown frame 2 0.044321 00.00.00 -> 80.00.00 FC 86 Unknown frame 4 0.088655 00.00.00 -> 80.00.00 FC 86 Unknown frame 6 0.132972 00.00.00 -> 80.00.00 FC 86 Unknown frame 11 0.177300 00.00.00 -> 80.00.00 FC 86 Unknown frame 14 0.221633 00.00.00 -> 80.00.00 FC 86 Unknown frame different wired packets on different machine with newer kernel: t42:/home/dpavlin# uname -a Linux t42 4.9.0-6-686 #1 SMP Debian 4.9.88-1+deb9u1 (2018-05-07) i686 GNU/Linux t42:/home/dpavlin# tshark -i eth2 | grep Ethernet Capturing on 'eth2' 2 0.006734442 fe:80:00:00:00:00 → e5:37:7f:e7:f0:fa 0x0000 86 Ethernet II 5 0.051063305 fe:80:00:00:00:00 → e5:37:7f:e7:f0:fa 0x0000 86 Ethernet II 9 0.095479055 fe:80:00:00:00:00 → e5:37:7f:e7:f0:fa 0x0000 86 Ethernet II 11 0.139803448 fe:80:00:00:00:00 → e5:37:7f:e7:f0:fa 0x0000 86 Ethernet II 17 0.184132590 fe:80:00:00:00:00 → e5:37:7f:e7:f0:fa 0x0000 86 Ethernet II 20 0.228461174 fe:80:00:00:00:00 → e5:37:7f:e7:f0:fa 0x0000 86 Ethernet II 22 0.273977679 fe:80:00:00:00:00 → e5:37:7f:e7:f0:fa 0x0000 86 Ethernet II 25 0.317120297 fe:80:00:00:00:00 → e5:37:7f:e7:f0:fa 0x0000 86 Ethernet II 30 0.361353892 fe:80:00:00:00:00 → e5:37:7f:e7:f0:fa 0x0000 86 Ethernet II 33 0.405682196 fe:80:00:00:00:00 → e5:37:7f:e7:f0:fa 0x0000 86 Ethernet II 34 0.450103254 fe:80:00:00:00:00 → e5:37:7f:e7:f0:fa 0x0000 86 Ethernet II 35 0.494430162 fe:80:00:00:00:00 → e5:37:7f:e7:f0:fa 0x0000 86 Ethernet II 37 0.538770200 fe:80:00:00:00:00 → e5:37:7f:e7:f0:fa 0x0000 86 Ethernet II 40 0.583004074 fe:80:00:00:00:00 → e5:37:7f:e7:f0:fa 0x0000 86 Ethernet II those where also visible as Unknown frame on eeepy on same port. # change switch port vlan dpavlin@black:~/dell-switch$ ssh sw-e300 User Name:admin Password:******** sw-e300# configure sw-e300(config)# interface ethernet g17 sw-e300(config-if)# switchport access vlan 1 sw-e300(config-if)# exit sw-e300(config)# exit sw-e300# exit Connection to sw-e300 closed. # update vlan table dpavlin@black:~/dell-switch$ ./dell-switch.pl sw-e300 'show vlan' dpavlin@black:~/dell-switch$ ./vlan-ports.pl ./log/*sw-e300_*vlan* 2>/dev/null ----------- ----- 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 sw-e300 1 X X X X X X X X X X X X X X X X . X X X X . X X sw-e300 4 . . . . . . . . . . . . . . . . X . . . . X . X sw-e300 5 . . . . . . . . . . . . . . . . . . . . . X . X sw-e300 20 . . . . . . . . . . . . . . . . . . . . . X X X