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| docs:guide-user:network:ipv6:ipv6.nat6 [2022/10/30 16:07] – [ULA prefix] avoiding delegation of the ISP GUA prefix can be intentional, e.g. to hide behind Tor or VPN vgaetera | docs:guide-user:network:ipv6:ipv6.nat6 [2023/09/17 23:39] – [Introduction] vgaetera | ||
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| Line 1: | Line 1: | ||
| - | ====== | + | ====== |
| - | {{section> | + | {{section> |
| ===== Introduction ===== | ===== Introduction ===== | ||
| - | * This how-to describes the method for setting up NAT6 aka NAT66 with IPv6 masquerading on your OpenWrt router. | + | * This how-to describes the method for setting up NAT66 aka NAT6 with IPv6 masquerading on your OpenWrt router. |
| - | * Assuming | + | * Assuming |
| - | * Avoid using NAT6 and better [[docs: | + | * Avoid using NAT66 and better [[docs: |
| - | * It is also best to avoid using NAT6 unless you are facing the following problems: | + | * It is also best to avoid using NAT66 unless you are facing the following problems: |
| * IPv6 multihoming without BGP. | * IPv6 multihoming without BGP. | ||
| * Performing stateless 1:1 NAT for migration purposes. | * Performing stateless 1:1 NAT for migration purposes. | ||
| Line 12: | Line 12: | ||
| * Creating a subnet for when the network doesn' | * Creating a subnet for when the network doesn' | ||
| * Being provided a smaller prefix than a /64 or worse, none at all or a ULA address. | * Being provided a smaller prefix than a /64 or worse, none at all or a ULA address. | ||
| - | + | * See also: [[docs: | |
| - | For NAT64 see [[docs: | + | |
| ===== Command-line instructions ===== | ===== Command-line instructions ===== | ||
| - | Enable the [[docs: | + | ==== 1. Firewall ==== |
| + | Enable IPv6 masquerading | ||
| <code bash> | <code bash> | ||
| Line 25: | Line 25: | ||
| </ | </ | ||
| - | Enable [[docs: | + | ==== 2. Network ==== |
| - | + | Disable IPv6 source filter | |
| - | ===== Extras ===== | + | |
| - | ==== References ==== | + | |
| - | * [[http:// | + | |
| - | * [[http:// | + | |
| - | + | ||
| - | ==== DHCPv6 | + | |
| - | Make sure DHCPv6 uses the following settings (on an unmodified OpenWrt installation these should by the default): | + | |
| - | * " | + | |
| - | * " | + | |
| - | * " | + | |
| - | + | ||
| - | You can check this by running the following command: | + | |
| <code bash> | <code bash> | ||
| - | # uci show dhcp.lan | + | # Configure network |
| - | ... | + | uci set network.wan6.sourcefilter=" |
| - | dhcp.lan.dhcpv6=' | + | uci commit network |
| - | dhcp.lan.ra=' | + | /etc/init.d/network restart |
| - | dhcp.lan.ra_management=' | + | |
| </ | </ | ||
| - | If the output is different, you are not using the defaults and you should set these options to the ones shown above. | + | Prefer [[docs: |
| - | If there is an additional line starting with '' | + | |
| - | Setups with " | + | |
| - | However, if " | + | |
| - | Therefore, enabling the " | + | |
| - | ==== ULA prefix | + | ===== Troubleshooting ===== |
| - | Typically relevant when you do not have a real global prefix assigned by your ISP (in which case your ULA should be a real ULA), AND you want to run local IPv6 (e.g. for NAT66), AND you have applications that preference IPv4 over IPv6 ULA addresses. | + | Collect and analyze the following information. |
| - | A trick to get around this is set your ULA prefix to a non-ULA value. | + | <code bash> |
| + | # Log and status | ||
| + | /etc/init.d/firewall restart | ||
| - | The default ULA ([[wp> | + | # Runtime configuration |
| + | ip -6 address | ||
| + | ip -6 rule show; nft list ruleset | ||
| - | A lot of clients will prefer IPv4 over a ULA IPv6 address if there is no global IPv6 address assigned, so you may need to change your existing ULA prefix to indicate a global address (i.e. trick it with a non-ULA prefix) to ensure traffic goes over IPv6 by default when possible. | + | # Persistent configuration |
| - | + | uci show network; uci show firewall | |
| - | When changing the ULA prefix, it doesn' | + | </ |
| - | + | ||
| - | Setting '' | + | |
| - | + | ||
| - | Using your ISP assigned prefix as ULA should also work. | + | |
| - | + | ||
| - | However, unless you have a static IPv6 prefix assigned by your ISP, this is not recommended, | + | |
| - | + | ||
| - | But normally if you have a static prefix that you can delegate across your LAN (i.e. real global addresses), then you won't need to change your ULA prefix. | + | |