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modified post 725f by Anonymous on Thu 14th Apr 2022 12:47
original post de0f by Anonymous on Thu 14th Apr 2022 12:47
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#!/usr/bin/ksh93

1	1	#!/usr/bin/ksh93
2	2
3	3	#
4	4	# Ethernet/tap forwarding via ssh
5	5	#
6	6
7	7	set -o xtrace
8	8	set -o errexit
9	9	set -o nounset
10	10
11	11	# list of commands our ssh session should execute
12	12	typeset -a sshcmds=(
13	13	"set -o xtrace ;"
14	14	"set -o errexit ;"
15	15	"brctl addbr br19 ;"
16	16	"brctl addif br19 tap19 ;"
17	17	"brctl addif br19 eno1 ;"
18	18	"brctl show ;"
19	19	"ifconfig tap19 promisc ;"
20	20	"ifconfig tap19 up ;"
21	21	"ifconfig br19 up ;"
22	22
23	23	"set +o errexit ;"
24	24
25	25	"read dummy ;" # dummy wait
26	26
27	27	#
28	28	# cleanup:
29	29	#
30	30	# we need to clean up the bridge interface ourselves, if
31	31	# we do not do that we risk getting that any subsequent
32	32	# ifconfig/ip/etc command hangs
33	33	#
34	34	"brctl delif br19 tap19 ;"
35	35	"brctl delif br19 eno1 ;"
36	36	"ifconfig tap19 down ;"
37	37	"ifconfig br19 down ;"
38	38	"brctl delbr br19 ;"
39	39	'kill -s HUP -${PPID} ;'
40	40	)
41	41
42	42	ssh \
43	43	-o ExitOnForwardFailure=yes \
44	44	-o PermitLocalCommand=yes \
45	45	-o LocalCommand="ifconfig tap19 up" \
46	46	-o Tunnel=ethernet -w 19:19 \
47	47	root@10.49.20.202 \
48	48	"${sshcmds[*]}"
49	49
50	50	# cleanup
51	51	# ...
52	52
53	53	# EOF.
54	54
55	55