Re: dnsmasq dhcp failure

Hi Bob

Am 28.11.2022 um 15:31 schrieb Robert K Coffman Jr. -Info From Data Corp.:
> Andrew/Erich,
> 
> My list emails are coming back from the list as blank. Can either of you 
> help?  

I have seen that, I would guess this is some filter issue with your 
uplink mail server.


I'd hate to see DNSMASQ replaced, but I understand the
> frustration of a critical function not working reliably.

I get your point, I also understand that probably a majority of the 
users can live with what they got. I just don't like software that does 
not perform or perfoms marginally.

I just would like to see this issue addressed and not just patched by 
another piece of software which might just as well fail.

> 
> This is what i'm attempting to send to the list:
> 
> I'm using 2.80 to provide DNS to a mail and SPAM filter, and I haven't 
> seen any of this behavior.  I also have DHCP running on the same version 
> in various locations and have not run across any of these reported 
> problems with it.

Great, what hardware are you running it on? My gut feeling is just that 
dnsmasq has become bloatware and uses lots of resources. You may not 
feel it on a sufficienly big machine. To tell the truth I would be OK 
with dnsmasq just telling me 'No sir, you don't have enough memory for 
me, I refuse to run'

> 
> Should we compare configurations to see if there is some common setting 
> that might contribute to this issue?

My configuration(s) are using mostly default valus, especially on the 
dhcp options. And I hope those would work.

> 
> Caching DNS server:
> 
> domain-needed
> bogus-priv
> listen-address=192.168.16.1
> listen-address=192.168.16.2
> cache-size=1000
> 
> Typical site deployment with DHCP and DNS (used as a forwarder for 
> internal A/D integrated DNS servers):
> 
> domain-needed
> bogus-priv
> resolv-file=/etc/dhcpc/resolv.conf
> no-resolv
> no-poll
> server=208.67.222.222
> server=208.67.220.220
> except-interface=eth0
> domain=REDACTED.local
> dhcp-range=192.168.54.50,192.168.54.254,200h
> dhcp-option=1,255.255.255.0
> dhcp-option=3,192.168.54.1
> dhcp-option=6,192.168.54.1
> dhcp-option=28,192.168.54.255
> dhcp-authoritative
> cache-size=150
> 

You may have a point in the dhcp authoritative parameter as this 
shortens the time to wait for a reply.

cheers

ET

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