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Forum Discussion
How to enable DNS over TCP on Orbi
Certain domans lookups that return with a large list of responses failing currently with:
;; Truncated, retrying in TCP mode.
From what I understood, this is because the response too large for UDP and tries to use TCP which gets a "connection refused".
I don't see an router setting to enable DNS over TCP. Has anyone else experienced this and/or have any suggestions?
6 Replies
axemolt wrote:Certain domans lookups that return with a large list of responses failing currently with:
;; Truncated, retrying in TCP mode.
No, I have never seen such a message. Where did this message appear? (Orbi log? computer?)
Acccording to this web page, switchover to TCP is supposed to be automatic:
https://www.infoblox.com/dns-security-resource-center/dns-security-faq/is-dns-tcp-or-udp-port-53/
I saw this on the my computer (mac), when I was doing an nslookup command. My browser wouldn't load https://travel.state.gov, so I started troubleshooting.
➜ ~ nslookup travel.state.gov
;; Truncated, retrying in TCP mode.
;; Connection to <orbi_ip>#53(<orbi_ip>) for travel.state.gov failed: connection refused.I confirmed that tcp port 53 is not open on the Orbi:
➜ ~ nc -vzu <orbi_ip> 53
Connection to <orbi_ip> port 53 [udp/domain] succeeded!➜ ~ nc -vz <orbi_ip> 53
nc: connectx to <orbi_ip> port 53 (tcp) failed: Connection refusedHowever, today that nslookup command is working and the browser is loading the page fine.
What Firmware version is currently loaded?
What is the Mfr and model# of the Internet Service Providers modem/ONT the NG router is connected too?
What Firmware version is currently loaded?
What is the Mfr and model# of the Internet Service Providers modem/ONT the NG router is connected too?
axemolt wrote:Certain domans lookups that return with a large list of responses failing currently with:
;; Truncated, retrying in TCP mode.
From what I understood, this is because the response too large for UDP and tries to use TCP which gets a "connection refused".
I don't see an router setting to enable DNS over TCP. Has anyone else experienced this and/or have any suggestions?
Model is RBR40 with latest firmware 2.5.1.22
