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My network setup:

wan > pfsense router > switch > unifi AP

Well I just got the switch. Brand new. I'm trying to set it up, but it's showing two IP addresses. The switch config utility says "IP address: 10.12.1.128" and then the next column says "Located on IP network: 10.12.1.131"

Does located on IP network mean the default gateway? Because my default gateway is 10.12.1.1.

So I tried to find my switch on pfsense to see what the actual IP was, but pfsense doesnt even list my switch on the arp or dhcp table. I have internet connectivity though so that means it established a link.

Do switches just not show up on an arp table? Whats the difference between the two IP addresses?

Edit: my desktop is plugged into the switch. My desktops IP is 10.12.1.131. Now I just need to know why the switch wont show on my router

  • What make and model is the switch? What “switch config utility” are you using? How would it help if the switch were to appear on pfSense? – Daniel B May 7 '16 at 17:25
  • tplink tl-sg105e. Tp link provides an installation cd to manage the switch. I like to assign my devices static IP addresses. If my router or switch turns off I dont want it to be assigned a new IP address every single time. But I can't assign a static IP address because pfsense doesnt even show its leasing an IP address – tytytyty May 7 '16 at 17:28
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I see, you want to make a DHCP reservation. The MAC address should be indicated somewhere on the device. It should also show up in the configuration utility.

In the configuration utility’s manual, on page 16, it says:

DHCP Setting: Enable or disable the DHCP function. If DHCP setting is enabled, the switch will obtain the IP address, subnet Mask and default gateway from the DHCP Server automatically; otherwise, these three items should be configured manually. By default, it is disabled.

(Emphasis mine)

So by default, the switch is using some undefined method to acquire an IP address. You must set it to use DHCP.

  • Ohh. I thought that meant make the switch act as a DHCP server and hand out IP addresses to everything that goes through it. – tytytyty May 7 '16 at 17:40
  • No, it’s unlikely you’d find a feature like that in any managed switch. Well, perhaps on some semi-enterprise-y units. – Daniel B May 7 '16 at 17:45

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