Questions tagged [ipsec]

Questions relating to IPSEC VPN configuration, operation and troubleshooting specifically.

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11 views

IKEv2 between Cisco router and Google cloud VPN

Hey I'm trying to create a tunnel between cisco router and google cloud vpn (client site) but the connection is stuck on stage 2 (UP-IDLE), need help where the problem may lie. Some debug that I get ...
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1answer
2k views

Cisco ipsec tunnel with nat to aws customer gateway

I'm trying to configure an IPSec tunnel between a Cisco router (ISR) and AWS (Customer Gateway). The connection to the ISP here is a PPPoE connection with a static private IP (e.g. 10.100.1.1) which ...
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2answers
94 views

Why cant't IPSec's Transport Mode ESP be used in NAT64 although ESP doesn't sign the new IP header?

In RFC6146 stated: Any protocols that protect IP header are incompatible with NAT64. This implies that end-to-end IPsec verification will fail when the Authentication Header (AH) is used (both ...
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1answer
1k views

Traceroute through IPSec tunnel

askk Hi. When I do traceroute from host 192.168.11.0/24 to the server 10.0.0.0/24, which is site B. When the packets get into the public area it show Request timed out (as shown in this figure). I'm ...
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1answer
191 views

Site-to-site IPsec and rerouting to another IPsec tunnel

We have three different geo sites (SITE1, SITE2 and SITE3) and each site has PFSense firewall installed. Sites have been connected together with IPSec tunnels. Also Site2 is connected to customer ...
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1answer
5k views

IPSec IKEv2 connection failure due to RSA authentication issue

I'm trying to get an IPSec/IKEv2 setup working, which was implement following this I don't understand why, but when a client connects (StrongSwan on Android here), the session is closed because the ...
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25 views

UNIFI USG GATEWAY IPSEC OVER L2TP VPN [closed]

At my office I have a Unifi USG Gateway that currently has 3 IPSEC VPN Tunnels (Lan-To-Lan VPN) configured. I also have a L2TP Remote VPN Network configured so that when I'm outside of my office I can ...
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25 views

Cisco ASA drops packets which match crypto acl. What the reason? [closed]

I've some problem with IPSEC tunnel between Cisco ASA and Fortigate. For some reason, packet 10.12.4.0/12 to 192.168.0.0/16 drops by ASA, despite the fact 192.168.0.0/16 is present in crypto ACL. Can ...
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0answers
115 views

Cisco site-to-site VPN tunnel Failed to find a matching policy [closed]

I have PaloAlto (PA) and Cisco ASA 5585-X located on two different sites, trying to configure IPsec VPN tunnel. [PA]-----------(internet)-----------[Cisco ASA] If i ping from Cisco ASA side lan to PA ...
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31 views

IPSEC Over GRE and GRE Over IPSEC

Can you show me example configuration IPSEC Over GRE and GRE Over IPSEC in Cisco IOS. I founded only example configuration GRE OVER IPSEC
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1answer
211 views

MTU/MSS Oddness?

We have an IKEv2 IPSec tunnel between two Sophos XG Firewall appliances in a corporate system for a remote site. We don't have any specialized MSS or MTU settings other than what the IPSec tunnel ...
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23 views

static IP multicast routing with IPSEC

for a specific application, I need to route a multicast flow with IPSEC (we use a CISCO ASA 5508 firewall), I am not a network expert then I will try to explain as best as I can our issue I don't need ...
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29 views

Does multicast over tunnels (e.g., GRE) require IGMP/MLD?

When subscribing to a multicast group on a tunnel device such as a GRE tunnel, are you supposed to participate in IGMP/MLD over that tunnel in order to announce your membership in the multicast group? ...
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1answer
794 views

How do you define interesting traffic using an IPSec Profile on a Cisco router?

I apologize if this is a duplicate, but I'm having difficulty figuring out how to define interesting traffic on a Cisco router using an IPSec Profile referenced by a tunnel interface. The old-school ...
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2answers
10k views

IPSec site to site VPN Fortigate

We have a site to site VPN connection to a branch office. Once in a while the connection drops for some reason and then we receive an error like this on the Fortigate 310b ike Negotiate ISAKMP SA ...
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1answer
71 views

Cisco IPsec VPN tunnel problem

I have a problem with VPN configuration. This is the topology I created: First updated licenses to make the VPN available: license boot module c1900 technology-package securityk9 IPsec Router ...
4
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1answer
2k views

Setup IPSec VPN to a node behind another Pfsense Box

I have a pfsense box (Call this BOX1) that has LANs and a WAN which connects to the internet and is used to create a VPN connection to a client: This has pfsense version 2.0.2-RELEASE (i386) I have a ...
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2answers
2k views

Keep Cisco site-to-site tunnel up permanently

I have Cisco ASA site-to-site tunnel with remote and which i don't have control. I have following config: crypto ikev1 policy 10 authentication pre-share encryption aes hash sha group 2 ...
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2answers
2k views

How to keep an ASA tunnel up for lifetime?

We have a Cisco ASA and at the remote end I have no idea what the device is. This is what happening: When I send a packet or generate interesting traffic, it brings up the tunnel and everything ...
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23 views

Editing a crypto map with multiple entries

We're attempting to bring up an IPSEC tunnel with a Vendor. An engineer created the crypto map and wasnt able to establish a connection. I edited the entry to change the diffie-hillman group and the ...
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2answers
1k views

IKEv2 tunnel between ASA and Mikrotik

Trying to move from pfSense to Mikrotik for an office router, and the only stumbling block is maintaining a site-to-site IPSEC tunnel between it and our Cisco ASA. The settings all look correct to me, ...
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1answer
27 views

IKEv2 notification payload regarding IKE SA

I am puzzled about two paragraphs regarding a notification payload in section 3.10 of RFC7296. There you can find the following: o Protocol ID (1 octet) - If this notification concerns an existing ...
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1answer
74 views

Is an IPSec connection between 2 devices behind NAT possible?

We have tens of IPSec connections between our office and customer site's. We use an extra router in the customer network (so behind NAT) to initiate the connection to our office where a PFSense router ...
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1answer
51 views

Access IPSec site from another IPSec site

Our company delivers, installs and maintains custom build hardware at customer sites. In all cases the delivered setup contains at least 1 server and 2 network devices. To keep the control over the ...
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2answers
77 views

Do network encryption devices support KMIP / PKCS#11 for key management, or is it all done using the CLI?

This question is about encryption in data communications, defined broadly to include: Line scrambling at layer 1 MACsec at layer 2 IPsec at layer 3 TLS at layer 4 etc. All of these encryption ...
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3answers
118 views

But confused about SSL VPN and IPsec Site -Site VPN

What might be difference between sslvpn and site-site vpn . Which one among two is secure and it's significance
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1answer
122 views

Confusion about Route based IPSEC site-site vpn and policy based IPSEC site-site VPN

I am confused about the major difference between a policy-based VPN and routed-based site-site Vpn
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2answers
43 views

Setup IPSEC in Hub/Spoke fashion

I'm trying to setup IPSEC tunnels in a hub/spoke type fashion. I've emulated this in GNS3 by creating three sites. Each site uses an IOSv router as it's WAN router. I'm using site 2 as the hub and ...
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2answers
19k views

Cisco ASA: Unable to establish IPSec tunnel with IKEv2: Auth exchange failed

This is a Cisco ASA 5515-X with software 9.6(3)20. The remote side didn't tell me what they use, must be Strongswan or something. Using the following debug commands debug crypto ipsec 255 debug ...
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1answer
97 views

Juniper QFX Site to Site VPN

Im trying to setup a site to site vpn between two Juniper QFX5110's. Each end of the link is on the same subnet (so directly connected switches over dark fibre). I have configured each physical ...
77
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4answers
73k views

What's the difference between IKE and ISAKMP?

I've been building IPsec VPNs for years but to be honest I've never fully grasped the technical difference between IKE and ISAKMP. I often see the two terms used interchangeably (probably incorrectly)....
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2answers
43 views

IPSEC between two offices with SAME local networks. How should I do nat? [duplicate]

I have two spokes with same local networks and want to do IPSEC between them. When I try to ping 172.17.214.111 from 192.168.5.0 (from right side to left side) I see packet on Cisco router and I see ...
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27 views

network cutover for remote site from L2 to L3 over IPSec tunnel

I have been trying to cutover one of our remote sites (A) to the new ISP we have purchased. The existing setup is utilizing L2 through another remote site (B) and coming back to the main campus. The ...
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3answers
96 views

Site-to-site IPSec tunnel over Load balancer

I'm having a following topology Could this be archived? I've configured this network, but routing between the two VLAN-s are not working. Using Ubiquity Edge X routers. Could this be archived with ...
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1answer
510 views

Is it possible to setup IPsec behind NAT without port forwarding?

We want to setup a IPsec connection between customer sites and our office so we can manage the hardware we place at customer sites (e.g. barriers). Its important that the VPN connection stays up all ...
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30 views

How SKEYID_a in IKEV1 phase 1 used in authentication in message 5 and 6?

How SKEYID_a in IKEV1 phase 1 used in authentication in message 5 and 6 ?
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2answers
67 views

IPSec Tunnel Mode

Assuming an organisation has 2 offices at two different locations and needs secure communication between them. As far as I understand IPSec, we can use tunnel mode to provide end to end encryption for ...
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0answers
1k views

Cisco ASA IPsec tunnel QM FSM error

I am setting up Cisco 5585 ASA for IPsec tunnel with one of cloud company. we already have lots of tunnel for various cloud provider and life if good but recently this tunnel giving me hard time to ...
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3answers
57 views

Do i need VLAN per customer when i want to give users (secure) access to specific customer sites

This question is a follow up on this question. We are currently working on the network design, nothing is implemented yet. Our network will exist out of our own (internal) network and lot of customer ...
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3answers
5k views

What is the proper way to config a Site to Site IPSEC VPN and a Remote Access VLAN on the same external interface? Cisco 891 ISR

I'd be happy to post the config or logs for reference but I am having trouble getting my remote access VPN working on the same interface as my site to site IPSEC VPN. I am using a dynamic crypto map ...
0
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1answer
117 views

Create IPSEC VPN between three Routers?

I'm attempt to build essentially an IPSEC tunnel mesh between three Cisco IOSv routers. I've been able to build an IPSEC tunnel between two directly connected routers but once I add the third router ...
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1answer
3k views

IPSEC Phase 1 error

Was does the MM_NO_STATE usually mean when having errors bringing phase 1 up? IPv4 Crypto ISAKMP SA dst src state conn-id status X.X.X.122 X.X.X.107 MM_NO_STATE ...
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1answer
387 views

Cisco ASA IPSec Site-to-Site VPN Rx Bytes not increasing

I have IPsec Site-to-Site VPN from my ASA to customer. After customer complain about VPN down, I reset the tunnel now I can see Login time duration 12h:34m Byte TX is 543240 and Byte Rx is 0. What ...
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0answers
35 views

CA certificate and Local certificate

There is something which is bothering me when i think about the CA cert and Local cert. Below are my queries which pertains to juniper but may be generic as well. 1) "request security pki ca-...
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0answers
10 views

Ipsec connection and nat only one site [duplicate]

There are two companies and two of them connected to each other with İPsec vpn. Company A has a server and company B want to reach to company A server. Which company need to configure nat on its ...
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0answers
162 views

QoS over IPSec Site-to-Site VPN: Concerns and Questions

(For clarification purposes: Kbps = Kilobits per second for bandwidth, KB/s = Kilobytes per second for file / data transfer stuff. I'm using them separately because XG knows KBps but not Kbps - ...
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1answer
40 views

IPSec does not work via backup interface

Cisco ASA 5506-X connected to two ISP - main and standby channel, interfaces outside_1 and outside_2. IPSec works via outside_1, but does not work via outside_2, if outside_1 down. At this moment ...
3
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1answer
475 views

Pass traffic from remote access to site to site tunnel [closed]

I have situation where remote access ipsec client have to connect to ASA firewall to send and receive traffic using site to site tunnel on the same ASA, in the logs I am seeing packets dropped as it ...
2
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1answer
71 views

Cisco 5505 ASA firewall Ipsec vpn- Can connect two outside different public ip to two different local subnets

I only get one IPSEC vpn connection up but not the other. Link to access configs on Google: https://drive.google.com/open?id=1yB_yIWvJ51A0UeNbkAEiTH9YMIEipqy_ profile1- outside interface - 66.x.x.x ...
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1answer
66 views

Site-to-Site IPSEC through load balancer with persistence

what I'm trying to achieve is a site to site IPSEC tunnel going through a load balancer, (both sites have pfsense and balancer is f5 big ip) the reason why i'm trying to do that is because: - Site A ...

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