Packet loss and network congestion when running DNSMASQ on PFsense

We are having a strange problem in which when we run dnsmasq on our pfsense box, we experience massive network congestion and packet loss. We have one pfsense box with two network cards and when we enable dnsmasq, our ISP drops 85% of the packets and ping times shoot up near 1000ms. As soon as I stop the dnsmasq service, packet loss is 0% and average ping time is 45ms.

We have a second pfsense box that only has one network card and when dnsmasq is enabled, we lose massive amounts of packets on our local network and our ping times internally shoot up past 4000ms. What in the world could cause this? As soon as dnsmasq is stopped, the problem goes away.
OAC TechnologyProfessional NerdsAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Your dnsmasq is not configured correctly.

You will find is that it is trying to resolve host names for any of your network traffic and it takes a long time to do it.

Test this by using nslookup or dig to perform a lookup on a hostname with dnsmasq on and off and compare the difference.

you then need to determine where dnsmasq is forwarding it's lookup queries to and ensure it is a valid dns and that it responds in an appropriate period of time.

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Linux Networking

From novice to tech pro — start learning today.