ddwrt dns packetsize

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NEPTUNE779
DD-WRT Novice


Joined: 17 Oct 2019
Posts: 15
PostPosted: Sun Apr 25, 2021 16:47    Post subject: ddwrt dns packetsize Reply with quote
Hello i getting this in my log from my vpn

DD-WRT daemon.warn dnsmasq[1788]: reducing DNS packet size for nameserver 103.86.99.100 to 1280

Is it possible to change the dns packetsize to 1280?

And where?

Question
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T-z3P
DD-WRT Novice


Joined: 18 Nov 2011
Posts: 26
PostPosted: Sun Apr 25, 2021 17:20    Post subject: Reply with quote
Pretty sure this is about MTU. According to the Wiki:

"MTU is the Maximum Transmission Unit. It specifies the largest packet size permitted for Internet transmission. Keep the default setting, Auto, to have the router select the best MTU for your Internet connection. To specify a MTU size, select Manual, and enter the value desired (default is 1400). You should leave this value in the 1200 to 1500 range."

To answer your question, you can change it from Setup > Basic setup > Optional Settings > MTU.
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Linksys WRT32X - DD-WRT v3.0-r50551 std (10/19/22)
Linksys EA6300 - DD-WRT v3.0-r40167 (backup router if something goes wrong with the main one)
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NEPTUNE779
DD-WRT Novice


Joined: 17 Oct 2019
Posts: 15
PostPosted: Sun Apr 25, 2021 19:00    Post subject: Reply with quote
I have tried that but still the same warning

DD-WRT daemon.warn dnsmasq[1764]: reducing DNS packet size for nameserver 103.86.99.100 to 1280

Rolling Eyes
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NEPTUNE779
DD-WRT Novice


Joined: 17 Oct 2019
Posts: 15
PostPosted: Sun Apr 25, 2021 19:04    Post subject: Reply with quote
I thinks it must be in the
setting in service dnsmasq settings

Additional Dnsmasq Options
script for adjusting dns packetsize

Idea
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SurprisedItWorks
DD-WRT Guru


Joined: 04 Aug 2018
Posts: 1447
Location: Appalachian mountains, USA
PostPosted: Sun Apr 25, 2021 21:24    Post subject: Reply with quote
edns-packet-max=1280

is what I use, in Additional Dnsmasq Options. See the dnsmasq man page. (Startpage is your friend.)
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2x Netgear XR500 and 3x Linksys WRT1900ACSv2 on 53544: VLANs, VAPs, NAS, station mode, OpenVPN client (AirVPN), wireguard server (AirVPN port forward) and clients (AzireVPN, AirVPN, private), 3 DNSCrypt providers via VPN.
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NEPTUNE779
DD-WRT Novice


Joined: 17 Oct 2019
Posts: 15
PostPosted: Mon Apr 26, 2021 6:50    Post subject: Reply with quote
Hello it works thanks

Very Happy Very Happy
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