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Questions tagged [ipsec]

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

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IP-Sec VPN Tunnel Established Between 2 Remote Machines. Why Can't Machines In Their Subnets Connect Across? [closed]

Have 2 Remote Ubuntu Machines in different subnets. one: 192.168.1.0/24 Two: 192.168.2.0/24 Established VPN tunnel between 2 machines, 1 in each subnet. Their IPs: Public IPs 1.1.1.1 2.2.2.2 ...
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2answers
28 views

Cisco ASA IKE Receiver: Runt ISAKMP packet discarded on Port 500

I have lots of ikev1 tunnel running on our production Cisco ASA5585 and today i have configured ikev2 tunnel for one of our new customer and i have started seeing following error, and not sure what is ...
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0answers
19 views

IKE Main Mode - Dynamic peers

So i searched for some time now, read the https://tools.ietf.org/html/rfc2409RFC and simply couldn't find an answer to why Main Mode needs static adresses. The RFC states Aggressive Mode does not ...
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2answers
41 views

SRX to ASA IPSec troubles

we built a VPN between partner's Cisco ASA (unknown version) and my Juniper SRX 340. The tunnel seems to go up properly: root@fw01> show security ike security-associations node0: ----------------...
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1answer
51 views

Cisco dVTI - Virtual-Access interface has no IP address

i'm struggeling with some dVTI Issue on a Cisco ASR1000 box. here is my configuration for the hub site: crypto keyring FOO-KEYRING pre-shared-key hostname r2-foo key iawg8b32hah ! crypto isakmp ...
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0answers
20 views

Chckpoint Remote Access VPN Multiple ISP external interface

I'm in a situation where I have to suggest the best solution when client has two ISP connected to a checkpoint firewall cluster. AFAIK, we cannot activate or make use of two external interfaces for ...
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3answers
55 views

IPSec VPN timers query

I have a couple of queries related to the IPSec VPN and I believe someone would clarify my doubts. Why IKE Lifetime and IPSec Lifetime is used? Can't we just run the VPN without re-negotiating? Why ...
4
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0answers
28 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 ...
1
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0answers
26 views

Mikrotik IPSec VPN Multi Site [closed]

We have a multi-site network with a "Central" facility and multiple "Sites". On each site, we installed a router with capabilities for VPN but always connect to internet through an ISP router. Also, ...
0
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1answer
21 views

IPsec VPN route in Checkpoint

I have created a ipsec VPN from site A (Cisco) to Site B (checkpoint R77.20). At site B, i have a static 1-1 NAT applied: ipx --ipy Tunnel is live and connection up; I can telnet my site B system ...
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31 views

IPsec tunnel with multiple networks NATed

I'm trying to set up an IPsec connection between two sites: our Azure network and our client's local network. To be flexible and avoid any current or potential future IP range overlappings I wand to "...
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0answers
10 views

Zywall USG 100 IPSec Routing

I own a Zywall USG 100, that manages 5 networks (2 WANs, 3 LANs); I built a site-to-site IPSec VPN with our CED, but now I'd like: to deny access to VPN from 2 of 3 above LANs, forcing them to reach ...
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0answers
12 views

Is that possible to create site to site VPN between 2 sites by using a pfsense virtual machine installed in Vmware workstation? [duplicate]

I need to connect 3 sites (Site A,B and C)+ AWS Cloud together over a site to site VPN. Each site should have a VPN tunnel to the cloud Each site should have a VPN tunnel to the other sites ...
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1answer
82 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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1answer
120 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 im using ...
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0answers
20 views

Multiple GETVPN groups inter-connectivity issue

Greeting Everyone!! I'm trying to stimulate an environment where I've DC and DR locations and remote sites have to access DC/DR services. For security, GETVPN is used. Initially tried using only one ...
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1answer
43 views

GRE over IPSec Transport vs. Tunnel Mode

I have a misunderstanding, in this article, Figure 4-9, in Transport Mode, first header (IPsec Hdr), is correct? Should not be GRE IP Hdr? https://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/...
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1answer
71 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 ...
4
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2answers
95 views

Is Cisco IPsec different from ordinary IPsec?

Is Cisco IPsec different from ordinary IPsec? Although Windows 10 has built-in VPN support for L2TP/IPSec, it does not support IPSec provided by Cisco. Thus, we generally need to install hand-made ...
1
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0answers
119 views

GRE over IPsec problem

I'm trying to build a GRE Tunnel with IPSec encryption between two routers, but I keep getting error message saying "%CRYPTO-4-RECVD_PKT_NOT_IPSEC: Rec'd packet not an IPSEC packet..." Immediately I ...
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0answers
21 views

does ipsec phase1 renewal keep connections?

I have an IPSec tunnel UP and I open a TCP connection when the phase1 expire and is renewed, Is the TCP connection supposed to stay alive or drop ? both in the theory and practical (cisco, ...
1
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1answer
45 views

VoIP, IPsec configuration

I have a topology in GNS3 with an IPsec VPN tunnel between C1 and C2 (https://imgur.com/dnNkssU). In clients networks i am configured a CME and a Softphone. When i make a call the quality is very bad. ...
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1answer
43 views

Can both IPsec endpoint be configured as the initiator?

Then configuring an IPsec tunnel, I can usually set if the device should act as the initiator or the responder (or even both). However, what would happen if both endpoint are configured as the ...
2
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1answer
59 views

MAC Address not resolving when IPSec VPN in place

I've created an IPSec VPN connection between two Mikrotik routers. They are connecting via IKEv2. Inside our two networks, we have a printer spooler which needs the printer's MAC address to verify it'...
3
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1answer
89 views

Traffic not send in IPsec with a Cisco ASA

I try to set up a site to site IPsec between an Ericsson router and a Cisco ASA, as shown below: My tunnel is UP and R1 seems to be working fine. However, my ASA does not forward traffic between ...
1
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1answer
376 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 ...
1
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1answer
251 views

IPSec route-based vpn st0 interface

As i know, the st0 interface is used when the gateways are configured with route based VPN. But my question is, say below is the topology A<---->B<---->C<---->D A and D are hosts, B and C ...
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1answer
37 views

What is the reason for encrypting Identity field under IPsec phase1?

Why Identity fields are encrypted in IPsec phase 1 around packet 5/6 ? provided that the Identity field contains IP of either end. Does it has any significance ? Does it holds anything different then ...
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0answers
60 views

ASA - communication between 2 tunnels

I have two IPSEC tunnels with an ASA in the middle Site A - 10.20.4.0 /24 (65.176.80.84) Site B - 192.168.142.0 /24 ASA - 10.99.206.0 /24 (95.12.22.33 Site A - 10.20.4.0 /24 can reach the ASA and ...
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1answer
152 views

IPSec SA being Unidirectional

From what I’ve read, IKE SAs are Birectional and IPSec SAs are unidirectional. But if the same proposals are to be agreed by both the ends, say protocol esp, Authentication algorithm as hmac-sha1-...
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0answers
41 views

IPSec Tunnel is up but no Communication with End Systems?

I need help for IPSec tunnel. Currently, I am working on a small task to create remote access between my laptop and office router, in order to access the office LAN network. IPSec tunnel is working ...
1
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1answer
68 views

IPSec tunnel between 2 LANs using HSRP in each side

This is my first post here, so tell me if there's something I'm doing wrong. I'm currently working with another IT student on our end of degree project and we're building our network in PT. Our ...
4
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1answer
268 views

How IPsec tunnel mode work without GRE

IPsec tunnel mode encrypt a whole IP packet and sends it as the payload of another IP packet. I have always used GRE as the encapsulation layer when doing IPsec encryption. However, how could I have ...
0
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0answers
203 views

Query on Cisco IPsec Licensing, HSEC-K9

I'm currently debugging an issue with IPsec tunnels and it seems like one of our client's NW engineers didn't install the HSEC-K9 license. The issue is that the new IPsec tunnels are not coming up ...
3
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1answer
103 views

High Availability for ISR 4431 IPSec VPNs

I have the following lab setup in GNS3. R1 & R2 are VPN endpoint at my datacenters and R3 is simulating a remote site. What i'm trying to accomplish is having one tunnel from R3 to the ...
1
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0answers
108 views

Why do the tunnel protocol on these two router show different values

Two routers R1 and R2 have a tunnel built between them in the 103.103.103.0/24 network. The end point of the tunnel are 75.75.75.2(on R1) and 76.76.76.2(on R2). Can anyone explain why does the Tunnel ...
1
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1answer
28 views

Can a VPN tunnel between routers be built with different tunnel protocol on both ends?

I have two routers and the tunnel between them is up and working well. Router1 has GRE/IP as the protocol on its tunnel interface, and as for Router2 the tunnel interface is working with IPSEC/IP. Can ...
3
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1answer
221 views

Azure VPN vs. Cisco ASA

I have a Cisco 5516-x with v9.7(1)21 on my end and I am trying to create a working VPN to Azure. It looks to me like phase1 goes well but phase2 fails due to policy mismatch. Any suggestions for how ...
3
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1answer
44 views

Why aren't we encrypting data on Network level instead of transport level when using e.g. HTTP [closed]

Why we are bothering to encrypt our data on a transport level, instead of just doing that on a network level with e.g. IPSec and get rid of the need to to that in upper layers. For example instead of ...
0
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1answer
84 views

Can I use the same IPsec tunnel for two VRF?

I have two routers linked by two logical links in two different VRF. I should move one router to another site and use Internet to keep the same connectivity. Since I use private IP addresses in my VRF,...
1
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2answers
130 views

AWS site-to-site VPN and multiple account VPC connections

I've configured a site-to-site VPN from our firewall (watchguard) to AWS. Now, how can I connect Account A with Account B? I've already an OpenVPN server in account A to which account B connects (...
3
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2answers
800 views

IKE phase 1 and phase 2

Was going through the IKE phase 1 and phase 2. I have some questions regarding the same which is bothering me with respect to main mode and quick mode.Please correct me if i go wrong somewhere. Phase ...
4
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1answer
292 views

Use cases for GRE over IPSEC

I'm trying to understand use cases for GRE over IPSEC. In the diagram below, each site uses GRE to encapsulate multicasts associated with OSPF. (There is still a requirement to configure SAs between ...
1
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0answers
206 views

AWS tunnel TCP retransmissions and DUP ACKs

I have a IPsec tunnel from my firewall towards AWS, the tunnel is up in both phases. If I run traffic sniffer in the firewall, I can see interesting traffic going through, but there are MANY TCP ...
1
vote
1answer
46 views

Shared secret key for Diffie-Hellman key exchange

From what i have learnt,in Asymmetric key there is public key and a private key. For instance: Step 1: Alice and Bob get public numbers P = 23, G = 9 Step 2: Alice selected a private key a = 4 and ...
3
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0answers
77 views

IPSec Tunnel not coming up: Issue with ACL?

I'm trying to bring up a IPsec tunnel between router and a bridge. I can see the Ipsec tunnel configurations are up and running but I think I have made a mistake in the ACL and hence the encr and decr ...
2
votes
1answer
200 views

how security association (SA) is established?

I'm a newbie in networking, still struggling to understand some concepts. I was reading a text describes security association (SA) in VPN. Whenever router R1 needs to construct an IPsec datagram for ...
3
votes
1answer
129 views

Pass traffic from remote access to site to site tunnel

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 ...
1
vote
1answer
99 views

Outbound NAT for single host behind an ASA located over an IPSEC tunnel [closed]

I have these two nets connected over the public internet with ASA 5510s. 192.168.0.0 < -- ASA1 ---> Internet <--- ASA2 --> 192.168.5.0 Each net does either a simple dynamic or static nat ...
2
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1answer
396 views

Junos IPSEC Tunnel to Azure & TCP-MSS

I am configuring a Juniper SRX 300 Series to establish an IPSEC tunnel to Azure. The Azure Vnet range is 192.168.10.0/23 The local range is 10.49.236.0/24. The configuration: (relevant bits with ...