DNS inspection is enabled by default, using the preset_dns_map inspection class map:
• The maximum DNS message length is 512 bytes.
• The maximum client DNS message length is automatically set to match the Resource Record.
• DNS Guard is enabled, so the ASA tears down the DNS session associated with a DNS query as
soon as the DNS reply is forwarded by the ASA. The ASA also monitors the message exchange to
ensure that the ID of the DNS reply matches the ID of the DNS query.
• Translation of the DNS record based on the NAT configuration is enabled.
• Protocol enforcement is enabled, which enables DNS message format check, including domain
name length of no more than 255 characters, label length of 63 characters, compression, and looped
pointer check.
See the following defaul
DNS inspection is enabled by default, using the preset_dns_map inspection class map: • The maximum DNS message length is 512 bytes. • The maximum client DNS message length is automatically set to match the Resource Record. • DNS Guard is enabled, so the ASA tears down the DNS session associated with a DNS query as soon as the DNS reply is forwarded by the ASA. The ASA also monitors the message exchange to ensure that the ID of the DNS reply matches the ID of the DNS query. • Translation of the DNS record based on the NAT configuration is enabled. • Protocol enforcement is enabled, which enables DNS message format check, including domain name length of no more than 255 characters, label length of 63 characters, compression, and looped pointer check.See the following defaul
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