network/doc/modemaccess.txt

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auf upstream1:
ip a a 192.168.100.2/24 dev up1
iptables -t nat -A PREROUTING -p tcp --dport 12345 -j DNAT --to-destination 192.168.100.1:80
lokal:
ssh -L:12345:172.20.72.63:12345 $USER@172.20.72.1
im browser: http://localhost:12345
danach aufräumen:
ip a d 192.168.100.2/24 dev up1
iptables -t nat -D PREROUTING -p tcp --dport 12345 -j DNAT --to-destination 192.168.100.1:80