WAN in dhcpclient mode but with static IP fallback

[shodanx]

Simply put, if the WAN port doesn't receive a dhcp lease, then it's because there's another client host plugged there.

I agree this should not be the default openwrt config, it's a special use case.

Here are other people asking about that.

The general theme is "dhcpclient with static fallback +optional dhcp server"

DHCP Interface with fixed IP-Address until lease received

Hello there, I just wanted to quickly ask if there is an easy way to configure an DHCP-interface (i.e. wan) in such a way that it has a fixed IP address until it receives an DHCP-lease. I've already tried setting proto to dhcp and setting ipaddr and netmask manually. config interface 'wan' option type 'bridge' option ifname 'eth0' option proto 'dhcp' option netmask '255.255.255.0' option ipaddr '192.168.100.100' But this doesn't work. Is there any functionality built-in i…

OpenWrt as DHCP client, fallback ip for accessing device?

If you have OpenWrt as a dumb AP client using DHCP, is there any option to provide a usable fallback ip address to acces the device in case the server is not available or because of some misconfiguration the OpenWrt dhcp client is unable to negotiate a lease, and not end up with a ip-less device that you cant access? I was thinking of putting an alias for dhcp client interface with an static ip address, but this should be in a different subnet than the main dhcp subnet range, and thus I would …

https://www.gargoyle-router.com/phpbb/viewtopic.php?t=2053

Set static ip if failed to get dhcp ip using udhcp in OpenWrt GUI

Hi, I have one more issue in openwrt GUI. By default, openwrt opens in static IP i.e., eg: 192.168.1.1. Suppose we have changed this static IP to DHCP IP and forgot to put the LAN then the board will not get IP from DHCP then it should get the default static IP. I am using udhcp for DHCP IP. So it should support fallback. Can anyone help me how can I set static IP after fail to get DHCP IP in 15 sec using UDHCP. Thank in advance. Regards Sakshi

OpenWrt/Yun: fall-back IP vs. Ethernet-DHCP-Client: ich hätte gerne beides!

[SOLVED but not really] DCHP Fallback IP

Issue 1: I have a device (Mikrotik mAP-2nD) that has two ports. I want the second port (labeled ETH2, but internally eth0.2 based on switch0 vlan2) to behave as a dhcp client, but if no dhcp server present, will default to a static ip address. Issue 2: This is related in that I have tested functionality of port as dhcp client and all works as expected. If however I set that port to have a static address, I lose functionality on that port (can't ping it or access GUI). Not sure what is causing…

https://forum.archive.openwrt.org/viewtopic.php?id=21197