port/builtin: switch from iptables to nft for transparent routing - #613
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AkihiroSuda
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Jul 23, 2026
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Let's keep iptables mode too and test the both in CI
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kept iptables as a fallback.
CI runs test with both nft and iptables, and a separate one with only iptables (no nft) to cover the fallback path.
Signed-off-by: akshitguptaa <akshitguptaa29@gmail.com>
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AkihiroSuda
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Jul 26, 2026
| // destined to transparent-bound source IPs are delivered locally. | ||
| // The firewall rules are implemented via nft, falling back to iptables if | ||
| // nft isn't available on the host (see setupTransparentRoutingNFT and | ||
| // setupTransparentRoutingIPTables). |
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Can we have a CLI flag --source-ip-transparent-backend to explicitly set the backend?
Also, the backend should be visible in PortDriverInfo, perhaps as Extra map[string]string
See #607 for how to extend the API
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Fixes #589