Configure LAN port on back to use a public IP to device (RV160)

[alexanderz2000]

Hello all,

Firstly, i'm very new to this modem/router and having LOTS of trouble doing something most any other small routes do automatically (ATT modem/router, spectrum modem/router.. )  

I have a block of 5 IPs, the first usable IP is on this router is (xxx.xxx.xxx.186) and i do have internet connection so no problem there.  I need to assign one of the public IPs from the block, say (xxx.xxx.xxx.187) to a device (SBC/Server) and use one of the 'lan' ports in the back to directly connect from the RV160 to the device/server but I get no internet (page not found), and i know i have the correct IPs needed for this.  

The default LAN settings work and i can use DHCP and get on line using private IPs but as mentioned, i need to use a public IP off the back LAN port and directly connect it to my server.   All my other modems/router do this but I guess something needs to be configure to tell this RV160 to use any of the 5 IP block on any given LAN port?   Can anyone offer some details on what i need to do to get this working?  Please remember i'm new to this router and many of its terms 'which i googled' have made it more confusing for me.  Please advise. 

[balaji.bandi]

I do not believe that works, instread you can do static NAT with Public IP with Priviate IP(same as using Publick UP) some of advantage is private side is safe your server rather expose to public internet

https://www.cisco.com/c/en/us/support/docs/smb/routers/cisco-rv-series-small-business-routers/Configuring_NAT_and_Static_NAT_on_the_RV160_and_RV260.html

[alexanderz2000]

thank you but i'm able to do this with my other modems with 4 ports in the back, I'm not assigning a public IP to a server, it's an SBC and another switch that needs a public IP assigned to it's main WAN interfaces, I need public IPs to assign them directly to devices (another switch or SBC, not an actual server).  I've seen the documentation but very confusing but I'm not using LAN IPs so clueless on what LAN IPs to use in those fields.  i need to enter public IPs into a web browser and reach the my device interface GUI's much like a public IP to a SonicWall GUI.   I may seem unsafe but i have restricted access to known IPs, all others are blocked. 

I currently have working the way i need it on my ATT modem and Spectrum modem (soon being forced to move off those services), they work exactly as stated above so why wouldn't the RV160 not do this?  Perhaps i'm don't understand how the Static NAT with Public IP with Private IP works if you say it's the same as public IP.   I have no problem paying someone for helping me and getting this working if your suggestion is correct for my needs but getting s cisco support contract for a one time deal is far to expensive.  

[alexanderz2000]

Hi, anyone else have a suggestion?  Static NAT is not what i'm looking for, I need to configure one of the 4 LAN ports in the back as a WAN port, basically pass  one of the IPs from the 5 ip block assigned to the main WAN interface through to one of the LAN ports, other modems/routes do this but I can't figure this out on this unit.   5IP block = Main wan = 38.xxx.xxx.186, LAN port 1, the configure my other device with that same pubic IP to gain access to it directly since Static NAT is not an option going from public to LAN, i need to go directly to WAN to WAN if that makes sense.   

[Georg Pauwen]

Hello,

if you have 5 available IP addresses, I assume you have a /29 mask ? Can you subnet (into /30 or /31, or even /32 masks ?

[alexanderz2000]

Yes, its a /29  I tried to use the masks as you suggested but the subnet is not the same as my 5IP block.   My the subnet to the 5ip block is .248 so i presume it needs to stay the same?  Very sorry, i'm new to this unit and still learning about networking, but what exactly do mean by 'can you subnet (.....)'?