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Adguard DNS buffer size too small

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askhe8

New Around Here
Hey there, recently setup a new AX-68U with Merlin 386.72. I have setup Adguard and Skynet with mostly default settings and everything is functioning very well. I checked my syslog and have been seeing occasional errors from adguard:

Code:
Aug  3 09:52:36 AdGuardHome[20795]: 2022/08/03 09:52:36.506790 [error] unpacking udp packet: dns: buffer size too small
Aug  3 09:52:39 AdGuardHome[20795]: 2022/08/03 09:52:39.547838 [error] unpacking udp packet: dns: buffer size too small

/proc/sys/net/core/rmem_max is already set to 2500000 by default as someone in another thread suggested. I'm wondering what else I can do to address this issue. Github and other forum posts/threads here have not revealed anything else I can do. I've used Merlin on all previous ASUS routers, but this is my first time setting up Adguard/Skynet. I've been lurking on the forum for a long time, but this is my first time posting. Any help is greatly appreciated. Thanks!
 
Hey there, recently setup a new AX-68U with Merlin 386.72. I have setup Adguard and Skynet with mostly default settings and everything is functioning very well. I checked my syslog and have been seeing occasional errors from adguard:

Code:
Aug  3 09:52:36 AdGuardHome[20795]: 2022/08/03 09:52:36.506790 [error] unpacking udp packet: dns: buffer size too small
Aug  3 09:52:39 AdGuardHome[20795]: 2022/08/03 09:52:39.547838 [error] unpacking udp packet: dns: buffer size too small

/proc/sys/net/core/rmem_max is already set to 2500000 by default as someone in another thread suggested. I'm wondering what else I can do to address this issue. Github and other forum posts/threads here have not revealed anything else I can do. I've used Merlin on all previous ASUS routers, but this is my first time setting up Adguard/Skynet. I've been lurking on the forum for a long time, but this is my first time posting. Any help is greatly appreciated. Thanks!
what servers are you using?
 
I using this one:

[/168.192.in-addr.arpa/]192.168.2.1
[/router.asus.com/][::]:553
[/www.asusrouter.com/][::]:553
[/lan/][::]:553
[//][::]:553
tls://unfiltered.adguard-dns.com
quic://unfiltered.adguard-dns.com
tls://security.cloudflare-dns.com
Atleast one of the DNS server on your list maybe the culprit for the UDP errors; however, this has been a known error on adguardhome in general. It is not exclusive to being an error that only appears while using AGH on Asuswrt-Merlin. It most likely has nothing to do with adguardhome and more to do with the encrypted upstream dns servers being used. If your DNS resolution is not failing, I would just assume at somepoint it will be fixed over time. If your DNS is actually failing, then I recommend using different upstreams, or using your DNS servers in parallel load balance policy to create redundancy.

But don't just take my word for it, @Tech9 has extensive experience with UDP packet errors.
 
A mix of filtered and unfiltered upstream DNS servers with all DoT, DoH and QUIC is something I'm failing to figure out.
I get what you mean. If I use squad9, I also use cloudflair-security, but not squad9 and plain (cloudlfair, or goggles) dns. Since squad9 has a security filtering, we would want to use another server that has a form of service filtering which is comparable.
 

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