Re: [Dnsmasq-discuss] reducing DNS packet size for nameserver 127.0.0.1 to 1280
Thanks Dominik the program runs at 5353 is chinadns-ng, it acts as a dns dispatcher and it's upstream is set to 8.8.8.8 or 1.1.1.1. this table is very helpful, it says 8.8.8.8 max at 1400, 1.1.1.1 max at 1452. https://discourse.pi-hole.net/t/dnsmasq-warn-reducing-dns-packet-size/51803/31 but the log only showed recently, after Dec 24th. this is weird. On Wed, Jan 5, 2022 at 01:51 Dominik Derigs wrote: > Hey Justin, > > On Tue, 2022-01-04 at 17:34 +0800, Justin wrote: > > Recently i see lots of logs in dnsmasq: > > reducing DNS packet size for nameserver 127.0.0.1 to 1280 > > almost one per minute > > > > my conf: > > [...] > > server=127.0.0.1#5353 > > once per minute sounds like this is happening all the time > (dnsmasq doesn't warn for one minute if it happened once). > > You should either increase the EDNS buffer size on the server > running at 127.0.0.1#5353 or add the config line > > edns-packet-max=1280 > > to your config to adhere to the limit. > > Furthermore, What server is running on port 5353 of your machine? > > I suggest reading this discussion, Pi-hole runs dnsmasq at its > heart and everything is directly applicable to your situation: > > https://discourse.pi-hole.net/t/dnsmasq-warn-reducing-dns-packet-size/51803 > > Maximum packet sizes for some commonly used server are here > > > https://discourse.pi-hole.net/t/dnsmasq-warn-reducing-dns-packet-size/51803/31 > > Best, > Dominik > > -- Regards Justin He ___ Dnsmasq-discuss mailing list Dnsmasq-discuss@lists.thekelleys.org.uk https://lists.thekelleys.org.uk/cgi-bin/mailman/listinfo/dnsmasq-discuss
Re: [Dnsmasq-discuss] reducing DNS packet size for nameserver 127.0.0.1 to 1280
Hey Justin, On Tue, 2022-01-04 at 17:34 +0800, Justin wrote: > Recently i see lots of logs in dnsmasq: > reducing DNS packet size for nameserver 127.0.0.1 to 1280 > almost one per minute > > my conf: > [...] > server=127.0.0.1#5353 once per minute sounds like this is happening all the time (dnsmasq doesn't warn for one minute if it happened once). You should either increase the EDNS buffer size on the server running at 127.0.0.1#5353 or add the config line edns-packet-max=1280 to your config to adhere to the limit. Furthermore, What server is running on port 5353 of your machine? I suggest reading this discussion, Pi-hole runs dnsmasq at its heart and everything is directly applicable to your situation: https://discourse.pi-hole.net/t/dnsmasq-warn-reducing-dns-packet-size/51803 Maximum packet sizes for some commonly used server are here https://discourse.pi-hole.net/t/dnsmasq-warn-reducing-dns-packet-size/51803/31 Best, Dominik ___ Dnsmasq-discuss mailing list Dnsmasq-discuss@lists.thekelleys.org.uk https://lists.thekelleys.org.uk/cgi-bin/mailman/listinfo/dnsmasq-discuss
Re: [Dnsmasq-discuss] reducing DNS packet size for nameserver 127.0.0.1 to 1280
dnsmasq is run by systemd: /usr/bin/dnsmasq -C /etc/dnsmasq.conf On Tue, Jan 4, 2022 at 5:34 PM Justin wrote: > > Recently i see lots of logs in dnsmasq: > reducing DNS packet size for nameserver 127.0.0.1 to 1280 > almost one per minute > > my conf: > > pid-file=/var/run/masq.pid > user=dnsmasq > keep-in-foreground > no-negcache > no-resolv > domain-needed > no-poll > dns-forward-max=1000 > cache-size=1000 > min-cache-ttl=3600 > port=53 > server=127.0.0.1#5353 > > dnsmasq is run by systemd: ___ Dnsmasq-discuss mailing list Dnsmasq-discuss@lists.thekelleys.org.uk https://lists.thekelleys.org.uk/cgi-bin/mailman/listinfo/dnsmasq-discuss
