Intermittently losing IP-connectivity with wifi

Hi,

At work we've got a problem with our wireless network.

We've got a lan, which consist of two subnets. In one subnet, the devices with static IP-addressen are gathered, such as printers, access points, etcetera.

The other subnet is for the clients. A single subnet is not enough to hold all the devices and clients.

The gateway consists of two routers in HSRP, which both have an IP-address in both subnets. An HSRP IP-address is also for each subnet.

Regularly, a wireless client loses the IP-connectivity, or so it seems. Wireless link is good, IP-address is present, but communication with anything other than the local lan is not possible.

Client can ping to other stations on the same subnet, to the secondary router, but not to the primary router or HSRP IP-address.

Pinging from primairy router to client is also not possible.

Can anybody provide me with a clue as to what may cause this problem?

Reply to
Iskander
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What AP are using, What IOS version are you using?

Reply to
Chad Mahoney

Load Etherreal onto a PC that sits on the same subnet as the wireless AP.

Make a note of all the MAC addresses involved:

  1. wireless PC having connectivity issue
  2. HSRP primary routers interface on same subnet as wirless AP
  3. HSRP virtual IP MAC address.

When the connectivity issue capturing the ARP and ICMP messages may give you a clue to the cause of the issue

Reply to
Merv

Hi,

It looks like this was an issue with HSRP and ARP. Somehow the active router does not always respond to ARP-requests, and thus is seen as not present bij the requesting host.

The problem has been solved by taking down the second router and removing the HSRP-bits from the config.

Thanks for the help!

Merv wrote:

Reply to
Iskander

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