Allow Isolated Guest network to access Pi-Hole?

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bl@d3runn3r
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Posts: 208

PostPosted: Fri May 03, 2019 8:21    Post subject: Allow Isolated Guest network to access Pi-Hole? Reply with quote
It's probably an easy task but for some reason it can't get it to work.

I created a isolated Guest network using this Wiki page
https://wiki.dd-wrt.com/wiki/index.php/Guest_Network

I did not use the new DNSMasq method (yet) because it would mean more work for me but will be done later if needed.

So i have this isolated Guest network on br1 with subnet 20.0.0.1 /24

And my private network 192.168.1.0/24 (br0)

I was reading some guides and iptable documents and i thought it should look something like this but it doesn't seem to work and have no idea how to easy troubleshoot this.

# Allow Guest Network to access Pi-Hole
iptables -I FORWARD -i br1 -o br0 -d 192.168.1.130 -p udp --dport 53 -m state --state NEW -j ACCEPT
iptables -I FORWARD -i br1 -o br0 -d 192.168.1.130 -p tcp --dport 53 -m state --state NEW -j ACCEPT

Any ideas?

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egc
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PostPosted: Fri May 03, 2019 9:20    Post subject: Reply with quote
For that we have to see all your rules:
telnet to your router and do:
iptables -vnL FORWARD

You can leave out the
Code:
-o br0
and the
Code:
-m state --state NEW
although these should not be the problem

Furthermore you can not use 20.0.0.1 as subnet that is not a private subnet

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Per Yngve Berg
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PostPosted: Sat May 04, 2019 8:20    Post subject: Reply with quote
iptables -I FORWARD -i br1 -o br0 -d 192.168.1.130 -p udp --dport 53 -m state --state NEW -j ACCEPT

This rule does not work because there is no state on UDP. It's a connectionless protocol.
Per Yngve Berg
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Joined: 13 Aug 2013
Posts: 5769
Location: Romerike, Norway

PostPosted: Sat May 04, 2019 12:16    Post subject: Reply with quote
Do you get the same results between br1 and br0?
bl@d3runn3r
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Joined: 10 Jan 2010
Posts: 208

PostPosted: Sat May 04, 2019 13:40    Post subject: Reply with quote
Thanks for all the answers, will do some test when home later today.
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bl@d3runn3r
DD-WRT User


Joined: 10 Jan 2010
Posts: 208

PostPosted: Tue May 07, 2019 12:50    Post subject: Reply with quote
eibgrad wrote:
The following should suffice.

Code:
iptables -I FORWARD -i br1 -d 192.168.1.130 -p udp --dport 53 -j ACCEPT
iptables -I FORWARD -i br1 -d 192.168.1.130 -p tcp --dport 53 -j ACCEPT


Are you sure the pi-hole knows how to route back to the Guest network? When the pi-hole is on the same network as the client, that's not an issue. The pi-hole and client are bridged; no routing required. But in order for the pi-hole to work w/ the guest network, that requires routing. And that's only going to work if the pi-hole is using the same default gateway as the rest of the network.


Thanks eibgrad for this post it worked.
Also thanks for your explanantion.

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