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Bryan Roth
Asked: 2012-03-29 11:22:24 +0800 CST

Laptop being assigned IPv4 address out of router's DHCP range

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I have a laptop connecting wirelessly to an E4200 Linksys router. The router is configured to use DHCP with a range from #.#.#.100 to #.#.#.254. However, the laptop is being assigned an IP address of #.#.#.80 which is below the specified DHCP range. I'm not sure how this is even possible. Also, the laptop has Internet connectivity.

Out of curiosity I performed a ping -a on my laptop's assigned IP address from another client and it's showing a completely different host name.

Any ideas on why the laptop is being assigned an IP address out of the DHCP range specified in the router?

router dhcp linksys ipv4

2 Answers

  1. Best Answer

    Look at the ipconfig /all output. What is it showing as the DHCP server. Is it coming from the router/device you expect? Perhaps you have a rogue DHCP server somewhere.

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  2. Your laptop probably had previously the #.#.#.80 address from a previous connection (it was connected elsewhere, or you just reconfigured your current router). After reboot, it asked to renew the ip address to the Linksys, which have the same ip address than the previous router. The answer was lost or something gone wrong, so your laptop kept its previous address.

    You have internet connectivity because both LAN have same settings (same gateway, and same DNS which is usualy the gateway).

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