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These scripts add and remove IPv4 forwarding and NAT from a Linux bridge while still allowing it to be managed by Proxmox.
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| Place each file in /etc/network/if-up.d/ or /etc/network/if-down.d/ as appropriate, mark as executable, and name whatever you want. |
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| #!/bin/bash -e | |
| # /etc/network/if-down.d/vmbr1 | |
| if [[ $IFACE == "vmbr1" ]]; then | |
| echo 0 > /proc/sys/net/ipv4/ip_forward | |
| iptables -t nat -D POSTROUTING -s '10.0.0.0/8' -o vmbr0 -j MASQUERADE | |
| fi |
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| #!/bin/bash -e | |
| # /etc/network/if-up.d/vmbr1 | |
| if [[ $IFACE == "vmbr1" ]]; then | |
| echo 1 > /proc/sys/net/ipv4/ip_forward | |
| iptables -t nat -A POSTROUTING -s '10.0.0.0/8' -o vmbr0 -j MASQUERADE | |
| fi |
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