Dns Domain Name Length Limit. The syslog message that you are seeing ASA--4-410001. The maximum number of octets in a domain name is 255.
When it comes to registering personal nameservers in your Personal DNS section the maximum field length is 63 symbols including dots. This is spelled out in RFC 1035 section 234. No coding skills needed.
63 letters63 letters63 letters62 letters The documentation says.
Because the Suricata rule in dns_invalid_sizerules uses the DNS responses EDNS UDP length which may be controlled by the attacker a second upper limit of 4096 bytes is enforced. Make your own responsive website or online shop with Moonfruits easy-to-use website builder. The maximum length of a fqdn not a hostname is 1004 characters. In the internal binary representation of the DNS the maximum length requires 255 octets of storage as it also stores the length of the name.