docs: Add documentation for ipv4.dhcp.dns and ipv6.dhcp.dns on bridge and ovn networks

Signed-off-by: Gwendolyn <[email protected]>

Author: gwenya

doc/reference/network_bridge.md

@@ -74,6 +74,7 @@ Key                                  | Type      | Condition             | Defau
 `ipv4.dhcp`                          | bool      | IPv4 address          | `true`                    | Whether to allocate addresses using DHCP
 `ipv4.dhcp.expiry`                   | string    | IPv4 DHCP             | `1h`                      | When to expire DHCP leases
 `ipv4.dhcp.gateway`                  | string    | IPv4 DHCP             | IPv4 address              | Address of the gateway for the subnet
+`ipv4.dhcp.dns`                      | string    | IPv4 DHCP             | Router IPv4 address       | Override the DNS servers announced over DHCP
 `ipv4.dhcp.ranges`                   | string    | IPv4 DHCP             | all addresses             | Comma-separated list of IP ranges to use for DHCP (FIRST-LAST format)
 `ipv4.dhcp.routes`                   | string    | IPv4 DHCP             | -                         | Static routes to provide via DHCP option 121, as a comma-separated list of alternating subnets (CIDR) and gateway addresses (same syntax as dnsmasq)
 `ipv4.firewall`                      | bool      | IPv4 address          | `true`                    | Whether to generate filtering firewall rules for this network
@@ -88,6 +89,7 @@ Key                                  | Type      | Condition             | Defau
 `ipv6.dhcp.expiry`                   | string    | IPv6 DHCP             | `1h`                      | When to expire DHCP leases
 `ipv6.dhcp.ranges`                   | string    | IPv6 stateful DHCP    | all addresses             | Comma-separated list of IPv6 ranges to use for DHCP (FIRST-LAST format)
 `ipv6.dhcp.stateful`                 | bool      | IPv6 DHCP             | `false`                   | Whether to allocate addresses using DHCP
+`ipv6.dhcp.dns`                      | string    | IPv6 DHCP             | Router IPv6 address       | Override the DNS servers announced over DHCP and RA
 `ipv6.firewall`                      | bool      | IPv6 address          | `true`                    | Whether to generate filtering firewall rules for this network
 `ipv6.nat`                           | bool      | IPv6 address          | `false` (initial value on creation if `ipv6.address` is set to `auto`: `true`) | Whether to NAT
 `ipv6.nat.address`                   | string    | IPv6 address          | -                         | The source address used for outbound traffic from the bridge

doc/reference/network_ovn.md

@@ -52,13 +52,15 @@ Key                                  | Type      | Condition             | Defau
 `dns.zone.reverse.ipv6`              | string    | -                     | -                         | DNS zone name for IPv6 reverse DNS records
 `ipv4.address`                       | string    | standard mode         | - (initial value on creation: `auto`) | IPv4 address for the bridge (use `none` to turn off IPv4 or `auto` to generate a new random unused subnet) (CIDR)
 `ipv4.dhcp`                          | bool      | IPv4 address          | `true`                    | Whether to allocate addresses using DHCP
+`ipv4.dhcp.dns`                      | string    | IPv4 DHCP             | Uplink DNS servers        | Override the DNS servers announced over DHCP
 `ipv4.dhcp.routes`                   | string    | IPv4 DHCP             | -                         | Static routes to provide via DHCP option 121, as a comma-separated list of alternating subnets (CIDR) and gateway addresses (same syntax as dnsmasq and OVN)
 `ipv4.l3only`                        | bool      | IPv4 address          | `false`                   | Whether to enable layer 3 only mode.
 `ipv4.nat`                           | bool      | IPv4 address          | `false` (initial value on creation if `ipv4.address` is set to `auto`: `true`) | Whether to NAT
 `ipv4.nat.address`                   | string    | IPv4 address          | -                         | The source address used for outbound traffic from the network (requires uplink `ovn.ingress_mode=routed`)
 `ipv6.address`                       | string    | standard mode         | - (initial value on creation: `auto`) | IPv6 address for the bridge (use `none` to turn off IPv6 or `auto` to generate a new random unused subnet) (CIDR)
 `ipv6.dhcp`                          | bool      | IPv6 address          | `true`                    | Whether to provide additional network configuration over DHCP
 `ipv6.dhcp.stateful`                 | bool      | IPv6 DHCP             | `false`                   | Whether to allocate addresses using DHCP
+`ipv6.dhcp.dns`                      | string    | IPv6 DHCP             | Uplink DNS servers        | Override the DNS servers announced over DHCP and RA
 `ipv6.l3only`                        | bool      | IPv6 DHCP stateful    | `false`                   | Whether to enable layer 3 only mode.
 `ipv6.nat`                           | bool      | IPv6 address          | `false` (initial value on creation if `ipv6.address` is set to `auto`: `true`) | Whether to NAT
 `ipv6.nat.address`                   | string    | IPv6 address          | -                         | The source address used for outbound traffic from the network (requires uplink `ovn.ingress_mode=routed`)