DHCP not working on WRT 1900ACSv2

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DDMan
DD-WRT Novice


Joined: 22 Dec 2008
Posts: 7

PostPosted: Mon Jun 17, 2019 23:32    Post subject: DHCP not working on WRT 1900ACSv2 Reply with quote
Hello all,

Currently, I have a WRT 1900ACSv2 (confirmed on the bottom of the device) running the latest firmware (06-11-2019-r40009).

I started on a previous firmware (~12/2017) and DDWRT was installed fine. Fresh factory reset, and it was working, however I have a number of NAT/Static IP's that I plug in. Once I add the static IP's and NAT info, DHCP stops working. On the old flash, I could disable "Use DNSMasq for DHCP" and DHCP would start working again. However, after flashing to this latest firmware (hoping it fixed the DHCP issue), that option is no longer there.

Everything works 100% fine, EXCEPT the DHCP. If I manually set my PC's IP address, I can connect to the device (and the internet) without a problem. It's specifically the DHCP which is NOT working.

I'm hoping someone can point me in the right direction. It takes me about an hour+ to plug in my static leases and NAT info, so I'm REALLY hoping I don't have to go back and do that again.

Thanks in advance.
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DDMan
DD-WRT Novice


Joined: 22 Dec 2008
Posts: 7

PostPosted: Tue Jun 18, 2019 0:10    Post subject: Reply with quote
As an update, I reverted back to an older build (v3.0-r39144), which DOES have the option to un-check "use DNSMasq for DHCP", and once again DHCP is working fine.
egc
DD-WRT Guru


Joined: 18 Mar 2014
Posts: 3988
Location: Netherlands

PostPosted: Tue Jun 18, 2019 8:34    Post subject: Reply with quote
For static leases I just add them to the DNSMAsq additional config with:
dhcp-host=00:09:XX:YY:ZZ:70,QNAP453,192.168.0.91,1440m

You can copy them from /tmp/dnsmasq.conf

Recent buidls are very strict in the names you give to the clients, only use letters and numbers other characters will cause DNSMasq to stop.

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Routers:Netgear R7800, Netgear R6400v1, Netgear R6400v2, Linksys EA6900 (XvortexCFE), Linksys E2000 (converted WRT320N), WRT54GS v1.
Install guide Linksys EA6900: http://www.dd-wrt.com/phpBB2/viewtopic.php?t=291230
OpenVPN Policy Based Routing guide: https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=321686
Install guide R6400v2:http://forum.dd-wrt.com/phpBB2/viewtopic.php?t=316399
OpenVPN Server Setup:https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=318795
Install guide R7800: https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=320614
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