Activity light flashes every 2 seconds or so on my switches



  • Quick easy question (I hope).  I have several switches around my house so there is a switch in most rooms.  Since installing PFsense all my switches activity lights will flash every two seconds anywhere a network cable is connected.  Even if No Pc is turned on ( I think).

    I did a search of the faq and mailing lists but didn't find anything.

    It's not really bothering me I am just curious as to what setting is causing this and why it is doing it.



  • get ethereal on one of your computers and let it packet sniff for a while, then see if you can come up with some correlation.  It's probably just broadcast traffic :)



  • Hello,

    I noticed this too…

    I wonder what it is...

    I might play a bit with etereal ;-)



  • Cool,  not the only person then.  I haven't had a chance to play with ethereal yet had other problems I havn't been able to solve yet.  Let me know if you find anything, I will try have a play tonight.



  • I did a fresh install of .94 and it seems to have stopped whatever activity was causing this.  The only option I can think of was some option that could make finding otherpeople on my lan almost instant rather than a few seconds wait.  I can't remember the name of the option and didn't find it again "yet" I will have another look for it tonight, and see if it is enabled.



  • Hi there,

    Did you ever figure out the problem?  My switch lights are also flashing every second or two.

    Let us know… thanks!

    -- Phob



  • Any chance you have CARP configured? With CARP the machines are sending out "Hey, I'm still alive" broadcasts so other clustermembers know about the availablility.



  • Its not PFSense on my network … I also have a Linksys WRT54GS which is flashed with a 3rd party firmware called DDWRT and used as a wireless access point.

    It turns out that my 2 second flashes are caused by something called STP or Spanning Tree Prototcal.  The fix for me was easy, I just disabled STP on my WRT54GS and voila, no more flashes.

    I should say, Ethereal was key to locating the issue... I had never seen a STP packet before... interesting! :)

    Thanks all!

    -- Phob



  • pfSense supports STP as well if used with bridgeconfiguration. Somebody of you are using it as Bridge?



  • @hoba:

    Any chance you have CARP configured? With CARP the machines are sending out "Hey, I'm still alive" broadcasts so other clustermembers know about the availablility.

    I don't think I had CARP enabled perhaps I did or had an option like that enabled.  Is carp enabled by default?  When I went to the page that allows you to configure carp nothing is ticked, but when I go to carp status it shows three nodes and there is a button "disable CARP"  no other info.

    And yeh I don't have the 2 second blinking anymore.



  • @Jesse7:

    @hoba:

    Any chance you have CARP configured? With CARP the machines are sending out "Hey, I'm still alive" broadcasts so other clustermembers know about the availablility.

    I don't think I had CARP enabled perhaps I did or had an option like that enabled.  Is carp enabled by default?  When I went to the page that allows you to configure carp nothing is ticked, but when I go to carp status it shows three nodes and there is a button "disable CARP"  no other info.

    And yeh I don't have the 2 second blinking anymore.

    CARP ip's are added under Virtual IP's.  They WILL make your switch port blink every second, its a heartbeat.


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