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Bug #12902

closed

DNS Forwarder creates a loop when "Use local DNS, ignore remote DNS servers" is selected

Added by Flole Systems over 2 years ago. Updated about 2 years ago.

Status:
Resolved
Priority:
Normal
Assignee:
Viktor Gurov
Category:
DNS Forwarder
Target version:
2.7.0
Start date:
Due date:
% Done:

100%

Estimated time:
Plus Target Version:
22.05
Release Notes:
Default
Affected Version:
2.6.0
Affected Architecture:

Description

I am using the DNS Forwarder, I set up a few DNS Servers in System->General Settings. Also I selected "Use local DNS, ignore remote DNS servers" as I have a few domain overrides set that need to be evaluated. Anyways, with that option I am always getting "REFUSED" as reponse, setting it to "Use remote DNS" causes it to work properly again. It looks like a loop is created there and the forwarders aren't passed properly to dnsmasq.

Related issues

Has duplicate Bug #13033: DNS lookups using DNS forwarder yields invalid cache entries in systemd-resolvedDuplicate

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 #1

Updated by Viktor Gurov over 2 years ago

  • Status changed from New to Not a Bug
  • Target version deleted (2.7.0)

Your issue is related to DNS rebind protection,
please read https://docs.netgate.com/pfsense/en/latest/services/dns/rebinding.html#dns-forwarder

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 #2

Updated by Flole Systems over 2 years ago

Why should this be related to DNS rebind protection? It happens for any query. Also on my system DNS rebind protection is disabled.

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 #3

Updated by Viktor Gurov over 2 years ago

Flole Systems wrote in #note-2:

Why should this be related to DNS rebind protection? It happens for any query. Also on my system DNS rebind protection is disabled.

it can be related to #12901 and https://thekelleys.org.uk/gitweb/?p=dnsmasq.git;a=commit;h=2561f9fe0eb9c0be1df48da1e2bd3d3feaa138c2

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 #4

Updated by Flole Systems over 2 years ago

No.... Can you please just leave issues that you don't understand for someone else to take care of? Thanks. Or at least try to reproduce before marking obvious bugs as "not a bug", then you would notice that /etc/resolv.conf only contains 127.0.0.1 and that dnsmasq is missing a list of the other remote forwarders, so it's causing a loop as it tries to use itself as an upstream server, which isn't the case with the other options as then /etc/resolv.conf is containing the remote DNS servers.

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 #5

Updated by Viktor Gurov over 2 years ago

  • Status changed from Not a Bug to New
  • Assignee set to Viktor Gurov
  • Target version set to 2.7.0
  • Plus Target Version set to 22.05
  • Affected Version set to 2.6.0
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 #6

Updated by Jim Pingle over 2 years ago

  • Status changed from New to Pull Request Review
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 #7

Updated by Viktor Gurov over 2 years ago

  • Status changed from Pull Request Review to Feedback
  • % Done changed from 0 to 100
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 #8

Updated by Danilo Zrenjanin over 2 years ago

  • Status changed from Feedback to Resolved

Tested against:

2.7.0-DEVELOPMENT (amd64)
built on Fri Mar 11 06:21:33 UTC 2022
FreeBSD 12.3-STABLE

The firewall resolves successfully using Forwarder, and the "Use local DNS, ignore remote DNS servers" option is set under System General.

I am marking this ticket resolved.

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 #9

Updated by Jim Pingle over 2 years ago

  • Has duplicate Bug #13033: DNS lookups using DNS forwarder yields invalid cache entries in systemd-resolved added
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 #10

Updated by Orion Poplawski about 2 years ago

I'm afraid that this broke my use-case. I set the following custom options:

no-resolv
server=208.67.222.222
server=208.67.220.220

because I specifically do NOT want the forwarder to use the local resolvers, but instead the ones I specify. Now the local resolvers always get added and there is no way to prevent it.

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