Cisco SG20X and Comcast Modem/Router

[tasimed]

Hello everyone!  I'm a little rusty on administering Cisco routers.  I have a small office building with Comcast Business Internet and using that for wireless and DHCP.  The Cisco switch (I know it's end of life) is being used for ethernet and PoE security cameras.  The Comcast router issues 10.1.10.X IPs and the switch is issuing 192.168.165.X IPs.  What's the best way to get these on the same IP range?  Thanks for any and all input!

[Flavio Miranda]

Hello,

  Keep only the Router as DHCP server or keep only the Switch as DHCP server. As per your description seems that you have DHCP on both.

[tasimed]

The switch has dhcp disabled and is back to a 192.168.1.254 address I can only access it via console devices attached to it are on a 192.168.165.X and Comcast Wifi is on 10.1.10.X

devices are getting internet but wifi and hardwired are not talking

[Flavio Miranda]

I got it wrong because this

"The Comcast router issues 10.1.10.X IPs and the switch is issuing 192.168.165.X IPs"

 I though switch was prrovising dhcp. 

Well, this seems to be the Classic router on a stick topology. 

 If you want to put all devices in one only range of IP all you need is one vlaln in the switch and put all ports on it. 

You can create an interface  vlan on this vlan amd assign an IP address on the same range as the router lan interface. 

Them you can use ip helper address on this interface vlan pointing to the router. 

 This will allow all devices to ask for IP address and be redireted to router by the switch.  And you can use this IP to manage the switch remotely 

 As soon as you plug a device in the switch,  it will broadcast a dhcp request, this will be sent to router by the switch and thats it. 

 The comunication between switch and router can use layer 2 wirh the port in access. Or trunk if your router support it.