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Configuring IPsec VPN within VMware NSX Edge

This article shows you how to create an IPsec VPN between a NSX Edge Gateway with a vCloud Director/NSX Manager and a remote Client site.

First you need basic details from client so that you can configure IPSec VPN from your end.Like you need Phase 1 and Phase 2 Details. (This document related to NSX Edge 6.3.2)

 

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Note: NSX Edge supports Main Mode for Phase 1 and Quick Mode for Phase 2.

Phase 1 Parameters

Phase 1 sets up mutual authentication of the peers, negotiates cryptographic parameters, and creates session keys. The Phase 1 parameters used by NSX Edge are:

  • Main mode
  • TripleDES / AES [Configurable]
  • SHA-1
  • MODP group 2 (1024 bits)
  • pre-shared secret [Configurable]
  • SA lifetime of 28800 seconds (eight hours) with no kbytes rekeying
  • ISAKMP aggressive mode disabled

In 6.3.2 you Can see basic details or you can say this is mixed mode like Phase 1 and Phase 2 they don’t have different tabs or options.

 

Here are details which you have to fill while configuring IPSec VPN for client.

Note: If you are doing this from HTML5 Console then in “Peer Subnets” You have to provide IP range from Increasing to Decreasing order like (192.168.11.0/24 and after that 192.168.10.0/24).

 

I was trying to update this tab from vCloud Director Web and i was not able to do so i changed this from vCenter > NSX manager > Edge settings.

Client side settings must match with your Edge settings.

If your Client have old router (Cisco) then you have to ask them to do settings with supported parameter and these parameters are:

1. SHA1
2. Diffie-Hellman Group – DH5 or DH2 (Old router can only support this IOS 12.4)
3. Encryption Algorithm – AES256

NSX Edge to Cisco

  • proposal: encrypt 3des-cbc, sha, psk, group5(group2)

After setup you can export Settings from Edge and share it with Client Network Team so that they can run it in their router and do the same setup which you have done in your Edge gateway.

Go to vCenter > NSX Manager > NSX Edges > Search your Edge and double click > Manage (R.H.S) > VPN Tab > IPSec VPN and from here you can download script for Cisco router.

 

You can copy and send it to client IT team.

Note: It will copy Shared key also so before sending to Client IT team remove that.

After this check the Tunnel status.

Go to vCenter > NSX Manager > NSX Edges > Search your Edge and double click > Manage (R.H.S) > VPN Tab > IPSec VPN

 

I was getting below Error so need to check your DH2 or DH14 settings.

  • If the Cisco device does not accept any of the parameters the NSX Edge sent in step one, the Cisco device sends the message with flag NO_PROPOSAL_CHOSEN and terminates the negotiation.

SandeepKaushik and ShaswatiMukherjee

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