DNS update (dnsupdate-rfc2136 stack) packet length issue

Archive Rancher 1.x
1

Hi all

We’ve setup rancher with external DNS update (dnsupdate-rfc2136 targeting our corporate Cisco Infoblox DNS on our LAN) and it works fine except : when the DNS query is too long (1 name for let’s say 8 hosts IPs), the UDP DNS packet length is more than 512 bytes.
Our network team reports that a default configuration of 512 bytes for a DNS packet is a standard. Thus, “big” DNS updates are rejected by their network equipments firewal rules. They refuse to set the rule to unlimited DNS packet length.:triumph:
Do you have any advices on how to handle such an issue ?
Can “big” DNS updates be fragmented into multiple packets ?

Thanks

Emmanuel