DNS - Slow Resolve Issue
Odd issue happening and would love some help on where to start troubleshooting. I'm getting very slow response times for DNS lookups (browsing to google.com, etc.). I can fix this when I reboot pfSense and all works fine for about 5 minutes, then the same issues starts happening again. DNS is set to my local DNS server, however I ruled that out as the issue as it's the same problem if I originate from that machine.
Also the other odd thing is that if I change my DNS to 220.127.116.11 everything seems to work fine again. This seems like an issue/setting with pfSense due to the fact that when I reboot the box it works just fine using my internal DNS for about 5 minutes, then it slows way down again.
Anyone have an idea?
Also to add:
- WAN connection is fine - good up/down speeds.
- Internet becomes sluggish when trying to brows from behind pfSense. This is after there DNS slowness appears as well.
Added some Firewall blocking logs I'm seeing. Not sure if they are related.
![Screen Shot 2015-07-27 at 3.32.50 PM.png](/public/imported_attachments/1/Screen Shot 2015-07-27 at 3.32.50 PM.png)
![Screen Shot 2015-07-27 at 3.32.50 PM.png_thumb](/public/imported_attachments/1/Screen Shot 2015-07-27 at 3.32.50 PM.png_thumb)
I don't think it's the above firewall issues. Another important update that I found while searching the forums. I'm using PPPOE for the WAN connection (DSL modem in bridge mode on the other end). If I disconnect/reconnect that interface (Gets another IP address) the connection works fine again.
Symptoms come back after about 5 minutes again …
So you have pfsense using what for its own dns? And where do your clients point to pfsense or your some other dns? Is this a forwarder or a resolver?
Clearly those are just out of state, but pfsense can not resolve them via ptr.. which I would hope your own local IP 172.16.10.105 should have a ptr.. What is your dhcp pfsense or something else? That 17.110 does not resolve but its owned by apple
;; QUESTION SECTION:
;18.104.22.168.in-addr.arpa. IN PTR