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https://www.sonicwall.com/support/knowledge-base/how-can-i-disable-enable-nat-traversal-in-vpn-settings/170505515372775/
Traditionally, IPSec does not work when traversing across a device doing NAT/PAT (Network Address Translation and Port Address Translation), meaning if either one of the devices or both the devices terminating IPSEC is behind a NAT device, IPSEC will not work. To overcome this problem, NAT-T or NAT Traversal was developed.
https://www.sonicwall.com/support/knowledge-base/the-log-shows-nat-discovery-peer-ipsec-security-gateway-behind-a-nat-napt-device/170503505007694/
The log shows "NAT Discovery : Peer IPSec Security Gateway behind a NAT/NAPT Device" 12/26/2019 6 10808. DESCRIPTION: The log shows "NAT Discovery : Peer IPSec Security Gateway behind a NAT/NAPT Device" RESOLUTION: These messages are sent during initialization of an IKE VPN when NAT Traversal option is enabled.
https://social.technet.microsoft.com/Forums/en-US/ece5ca22-670a-4e29-8f37-a850ec00db2b/vpn-nat-traversal
Unfortunately in order for clients assigned to the 10.x.x.x range to VPN in to an organisation, the VPN gateway/Firewall must support NAT-Traversal. We are using TMG as our VPN gateway. It is in edge firewall mode with no other devices between the clients. It also uses PPTP as its encryption protocol.
https://community.cisco.com/t5/other-security-subjects/nat-in-pix-to-sonicwall-vpn-configuration/td-p/127347
What it happens is that when it is being established the VPN, the log in the Sonicwall firewall it registers the following error "NAT Discovery: Peer IPSec Security Gateway doesn't support VPN NAT Traversal".
https://aws.amazon.com/premiumsupport/knowledge-center/configure-nat-for-vpn-traffic/
Be sure that your route table has a default route with a target of an internet gateway. Allow inbound traffic using UDP port 500 (ISAKMP) and 4500 (IPsec NAT-Traversal) in the instance's security group rules. Disable source/destination checks to allow the instance to forward IP packets. Configure VPN Connection
https://blogs.technet.microsoft.com/privatecloud/2013/04/10/azure-site-to-site-vpn-fails-to-transmit-datatales-of-nat-traversal/
Apr 10, 2013 · Azure Site to Site VPN Fails to Transmit Data–Tales of NAT Traversal ... Apparently you can’t do that – which is interesting because one of the requirements is that the on premises VPN gateway needs to support NAT traversal. That is required because the Azure Virtual Network is behind a NAT device. But apparently, the NAT-T support is not ...
https://social.msdn.microsoft.com/Forums/azure/en-US/19eb5ac0-5fb1-4afa-8081-5afc32cb04fd/is-nat-supported-within-an-ipsec-vpn-connection
Jan 30, 2019 · At the moment there cannot be a IPSec VPN connection established when either of the devices involve NAT. Therefore you cannot have an on premise VPN device behind a NAT and this cannot be applied on a VNet gateway since customers will not have access to configuring such rules for a VPN gateway.
https://community.cisco.com/t5/security-documents/how-does-nat-t-work-with-ipsec/ta-p/3119442
Q2: How does NAT-T work with ISAKMP/IPsec? NAT Traversal performs two tasks: Detects if both ends support NAT-T; Detects NAT devices along the transmission path (NAT-Discovery) Step one occurs in ISAKMP Main Mode messages one and two. If both devices support NAT-T, then NAT-Discovery is performed in ISKAMP Main Mode messages (packets) three and ...
https://community.spiceworks.com/topic/463706-sonicwall-site-to-site-vpn
Mar 26, 2014 · I have never setup a site to site VPN before and seem to be struggling with possibly the easiest... Home. Home > Networking > SonicWALL. Sonicwall Site to site VPN. by Emma7269. on Mar 26, 2014 at 09:36 UTC 1st Post ... NAT Discovery : Peer IPSec Security Gateway doesn't support VPN NAT Traversal.4.2/5(107)
https://docs.netgate.com/pfsense/en/latest/vpn/ipsec/ipsec-nat-t-support.html
IPsec NAT-T Support¶. Yes, NAT Traversal for IPsec (NAT-T) is supported in all current versions. It is configured on the Phase 1 options for an IPsec tunnel.
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