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Huawei B535-333 not forwarding DHCP

cancunia

Super Pro Member
I have a Three branded B535-333 and wanted to use it for my home broadband with Pi-Hole but it turns out that DHCP requests are somehow getting blocked / lost when using the Pi-Hole DHCP server. I'm guessing that this is a general issue with this router not related to the Pi-Hole DHCP software but am a bit surprised if / that I'm the first person to notice this so thought I'd ask around to see if anyone has a solution?
I've made sure that the B535-333 DHCP server is turned off & when I do that, no devices get an IP address. I've tested this setup with other routers, so I know it works and is isolated to the B535-333.
There's maybe a known way to get around this, so if anyone has a solution, suggestions gratefully accepted!

I've also posted on Kitz, just in case there's someone there with that doesn't also look on this forum. If I get a solution, I'll post it in both forums.

Thanks
 
How do you mean forwarding? Are you talking about using the Wi-Fi on the Three router and the DHCP requests from wireless clients not making it to the Pi?
 
How do you mean forwarding? Are you talking about using the Wi-Fi on the Three router and the DHCP requests from wireless clients not making it to the Pi?
Correct, both the Pi DHCP server & clients are on the B535-333 router WiFi. I also tried a client on an Ethernet port but it made no difference.
I'm guessing that the broadcasts are blocked, but not sure and was hoping that I'm not the first one with this issue.
 
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Correct, both the Pi DHCP server & clients are on the B535-333 router WiFi. I also tried a client on an Ethernet port but it made no difference.
I'm guessing that the broadcasts are blocked, but not sure and was hoping that I'm not the first one with this issue.
Same if you Ethernet cable the DHCP server to the router?

Have you looked into nmap to test the DHCP server to ensure a lease is granted? Anything in the server log to suggest a request is received?
 
As above, I wouldn't expect a DHCP server connected over Wi-Fi to work reliably, some access points will convert broadcast traffic to directed unicast which breaks things like that. Connect the Pi with a cable and see what happens.
 
Same if you Ethernet cable the DHCP server to the router?

Have you looked into nmap to test the DHCP server to ensure a lease is granted? Anything in the server log to suggest a request is received?
Not tried it with the DHCP server cabled, but no luck with a cabled client & server on WiFi. To be honest, I don't want to use it that way even if it does work. I'll look at the server log if I can find it (it's part of the Pi Hole package & have never had cause to try & look at it before).
As above, I wouldn't expect a DHCP server connected over Wi-Fi to work reliably, some access points will convert broadcast traffic to directed unicast which breaks things like that. Connect the Pi with a cable and see what happens.
The thing is it works fine with at least 2 other routers including the one that I'm using now , but it could well be as you say with the B535-333. I'll do some more testing later with another Pi to try to bottom it out.
 
Update, many thanks to @jpm & @mikeliuk for the pointer to using a wired DHCP server. I built a test Pi with dnsmasq for the DHCP server and it works fine on the B535-333 with the Pi DHCP server via an ethernet cable but not via WiFi.
I'll do some more testing with the router config now that I have a standalone test rig. The thing is that I've had my DHCP Pi on WiFi for months and on at least 2 different routers and also IIRC a Cisco WAP without issue.
I'd rather not go back to a separate router & WAP, or even a second Pi with DHCP. Unfortunately, connecting my 'live' daily Pi via Ethernet is not an option as they are in separate rooms.
 
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Just to be sure, I tried the test Pi DHCP on my old Linksys router, DHCP works fine on Ethernet & Wifi.
Thanks again for the replies and info.
 
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