Hot Downloads



The forum is in read only mode.
Welcome, Guest
Username: Password: Remember me
  • Page:
  • 1

TOPIC: Basic Question on IP address assignment

Basic Question on IP address assignment 9 years 9 months ago #35288

  • skylimit
  • skylimit's Avatar Topic Author
  • Offline
  • Distinguished Member
  • Distinguished Member
  • Posts: 158
  • Thank you received: 1
Hi all,

I'm hoping I can get help with assigning IP addresses for a network setup at work. Basically, we have a PC with 3 NICs. One connects to our clients corporate network, while the other two are for us the service provider to use. The PC runs an application that communicates with a component on our network over a VPN connection. For redundancy, two basic routers have been installed so that should the VPN via ISP1 fail, the backup router can route traffic.

Is it technically correct to assign IP addresses to the two NICs as I have done it in the diagram below? i.e. can I have two NICs on the same network (

OR is it technically correct to have both NICs on diff networks like so:

The initial idea was to connect both router to a switch, but my client cant be bothered to get a switch. Static routes are set on the box so that the app can failover if required.

Any contributions appreciated
" are never too old to learn" anon

2 NIC one PC 9 years 9 months ago #35289

  • Arani
  • Arani's Avatar
  • Offline
  • Moderator
  • Moderator
  • Posts: 745
  • Karma: 4
  • Thank you received: 10
Hi skylimit

I can't find any problems with your arrangement. One point to make sure of.
If there are any applications that need to use either of the network cards, you might have to ensure that manually, so use specific routes. You might even want to setup some static routes on the pc based on source IP address, if and only if you need it.

Otherwise don't see any problem with the arrangement.

Picking pebbles on the shore of the networking ocean

Re: Basic Question on IP address assignment 9 years 9 months ago #35290

  • Losh
  • Losh's Avatar
  • Offline
  • Distinguished Member
  • Distinguished Member
  • Posts: 103
  • Thank you received: 0
Hi. Actually i too dont see any issue with the two configurations unless you are using dhcp. The 2 will work ok,u just need to correctly configure the default gateway and ip routes.
~ Networking :- Just when u think its starting to make sense......... ~
  • Page:
  • 1
Time to create page: 0.125 seconds


Cisco Routers

  • SSL WebVPN
  • Securing Routers
  • Policy Based Routing
  • Router on-a-Stick

VPN Security

  • Understand DMVPN
  • GRE/IPSec Configuration
  • Site-to-Site IPSec VPN
  • IPSec Modes

Cisco Help

  • VPN Client Windows 8
  • VPN Client Windows 7
  • CCP Display Problem
  • Cisco Support App.

Windows 2012

  • New Features
  • Licensing
  • Hyper-V / VDI
  • Install Hyper-V


  • File Permissions
  • Webmin
  • Groups - Users
  • Samba Setup