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grantgibson
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Changing IP range to avoid office VPN clash

Hello. I have a Virgin Super Hub, hardware version 1.03. I'm running the default IP range, i.e. with the router at 192.168.0.1 and DCHP running from 192.168.0.2 to 254.

At work we have a Cisco IPSec compatible VPN. It just so happens our office network is on the same LAN IP range - i.e. 192.168.0.x. The result is that I can connect to the office VPN no problems, but once I'm on there I can't access LAN resources (file servers, etc) as my PC / Mac sees me entering an IP like 192.168.0.4 and routes those packets locally rather than over the VPN.

All of my colleagues on Virgin have the same problem, but users on other ISPs (which typically use the 10.x range or 172.x range) have no problems.

So... sorry for all the rambling context, but to my question: Is there a tried and tested procedure for switching to a different IP range on the VM Super Hub? 

The LAN IP field seems to be free text, which is a bit terrifying. Can I simply change that to a 10.x range?  Does the DHCP range automatically follow?  Any tips greatly appreciated!

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Eeeps
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Re: Changing IP range to avoid office VPN clash

Simple answer is yes, you can change it (which SH do you have BTW?)

An easier less massive change would be to simply change the third octet to something like 1
(i.e. 192.168.1.0 mask 255.255.255.0), gateway at 192.168.1.1

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gary_dexter
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Re: Changing IP range to avoid office VPN clash

Wow - imagine setting your office subnet up the same as 99% of home users use on their internal networks. Madness!!

You can login to the hub admin page and change the DHCP starting range. Or enable the guest network and use that for your work VPN as it uses the 192.168.1.X network. 


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gary_dexter
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Re: Changing IP range to avoid office VPN clash


@Eeeps wrote:

Simple answer is yes, you can change it (which SH do you have BTW?)

An easier less massive change would be to simply change the third octet to something like 1
(i.e. 192.168.1.0 mask 255.255.255.0), gateway at 192.168.1.1


192.168.1.x is reserved for the guest network


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apcyberax
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Re: Changing IP range to avoid office VPN clash

Fire that IT guy

I'm a Very Insightful Person, I'm here to share knowledge, I don't work for Virgin Media. Learn more

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Eeeps
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Re: Changing IP range to avoid office VPN clash


@gary_dexter wrote:

@Eeeps wrote:

Simple answer is yes, you can change it (which SH do you have BTW?)

An easier less massive change would be to simply change the third octet to something like 1
(i.e. 192.168.1.0 mask 255.255.255.0), gateway at 192.168.1.1


192.168.1.x is reserved for the guest network


You can tell I don't use router mode - 192.168.2.0/24 then?

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gary_dexter
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Re: Changing IP range to avoid office VPN clash

Yes. 192.168.0.x is default, 192.168.1.x is for guest and 192.168.100.x is for the modem (hence why you can login to 192.168.100.1 when running in Router Mode as well as 192.168.0.1). 


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grantgibson
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Re: Changing IP range to avoid office VPN clash

Thanks very much for your responses.

In case anyone else needs this in future, please note that there's a strange bug/limitation that you can't switch straight to IP ranges like 192.168.2.x on the Super Hub. Instead, going for something like 192.168.20.x works directly (without requiring multiple reboots). The issue is described here: https://neildeadman.blogspot.com/2014/08/virgin-media-superhub-2-changing-lan-ip.html

And just for completeness, here's the process for users on default settings:

  1. Go to 192.168.0.1 which should take you to your Super Hub admin
  2. Enter the credentials printed on the bottom of your router (or alt password if you've previously changed it)
  3. Go to Advanced Settings
  4. Go to the DHCP Settings section
  5. Under LAN IP change IP Address to 192.168.20.1
  6. Click Apply, the router will reboot
  7. If you're on wifi, disconnect wifi, wait for the router to reboot, then reconnect wifi. If you're on a wired connection you might be best rebooting your computer. This will give you a new DHCP address in the new range.
  8. You might need to restart other devices on your home network (e.g. iPads, smart devices) in order to pick up with new network range.
  9. If you need to get into your Super Hub settings again, remember the address is now 192.168.20.1 (not the default 192.168.0.1)