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from typing import List, Optional

from knot_resolver.datamodel.types import IPv6Network, IPv6Network96, TimeUnit
from knot_resolver.utils.modeling import ConfigSchema


class Dns64Schema(ConfigSchema):
    """
    DNS64 (RFC 6147) configuration.

    ---
    prefix: IPv6 prefix to be used for synthesizing AAAA records.
    rev_ttl: TTL in CNAME generated in the reverse 'ip6.arpa.' subtree.
    exclude_subnets: IPv6 subnets that are disallowed in answer.
    """

    prefix: IPv6Network96 = IPv6Network96("64:ff9b::/96")
    rev_ttl: Optional[TimeUnit] = None
    exclude_subnets: Optional[List[IPv6Network]] = None