Questions tagged [ipsec]

Internet Protocol Security (IPsec) is a protocol suite for securing Internet Protocol (IP) communications by authenticating and encrypting each IP packet of a communication session. IPsec also includes protocols for establishing mutual authentication between agents at the beginning of the session and negotiation of cryptographic keys to be used during the session.

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61 views

Should users have access to the IPsec pre-shared key?

We are in the process of switching from Hamachi to Meraki VPN by Cisco. Hamachi was managed internally, but this new VPN solution is managed by an external party and they have set it up as L2TP/IPsec ...
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Is IPsec VPN still necessary when already using HTTPS protocol? [duplicate]

There are 2 sets of API each hosted in 2 different organisations: my client's organisation and her partner's organisation. The servers from the 2 organisations communicate between each other through ...
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Ipsec fragmentation needed attack

I have this configuration |Subnet-1|<-->|GatewayA|<-->|Router|<-->|GatewayB|<-->|Subnet 2| Following this study from inria,for a Uni project, I'm trying to implement a DOS ...
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47 views

ikev2 handshake : 4 or 8 packets? [closed]

I open wireshark to inspect the ikev2 handhsake and noticed it is 8 packets instead of 4. Two groups of 4 packets, one originating from the first peer and the other from the second peer. Is it normal ?...
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Why does IKE have two phases?

Why does have IKE have two phases, two levels of security associations, two sets of authentication and encryption algorithms, two sets of options around lifetimes and renogiations? It seems ...
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4k views

How credible are the rumors that the NSA has compromised IPSec? [closed]

Part of the Snowden revelations was that the NSA had targeted IPSec. But I'm having trouble separating FUD from legitimate issues. How credible is this? Are there ways to use IPSec to be confident ...
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36 views

Can I use IPSec for anonymous browsing (like in commercial proxies)?

In class, we learned how to set up a VPN between two remote sites using IPSec in tunnel mode. I have a VPS for hosting my website (with root access), but if I set up a tunnel between my PC and the VPS,...
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2answers
67 views

What does it mean that Ikev1 (IPSec) protects peer identities in main mode?

Does it mean that the source IP is replaced with something else (like if in IP spoofing) so intermediate routers don't know who is sending the packet?
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2answers
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Certificates(CA certificate and EE/Local certiificate)

There is a small confusion related to CA certificate and Local certificate. I had asked a similar question before. This time, its a little specific. For authentication using PKI, below are the steps. -...
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1answer
436 views

Windows 10 IPSec VPN not respecting configured parameters (notably: encryption method)

I am currently trying to establish a VPN connection from my Windows 10 Enterprise 1909 to a remote VPN gateway, using the built-in Windows VPN / IPSec client. Since the UI does not provide all options ...
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Why do IPSec VPN Phases have a lifetime?

I was working on a bug with our VPN, and read about VPN Phases 1 and 2, each of which have a lifetime in seconds. I was investigating to validate if these had anything to do with the bug we had and ...
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Performance comparison between AES256 GCM vs AES 256 SHA 256

I understand GCM Crypto uses ESP Encryption only for ESP and Authentication algorithm. whereas AES 256 SHA256 uses AES for ESP Encrypt and SHA256 for Auth algorithm. Could someone help clarify the ...
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What is the real risk of clicking a link? [closed]

If I were to click a link on any of my devices, be it over text message, email, or from a webpage, and enter no information/actions with the target page. What is the worst that could happen?
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1answer
125 views

How does IKEv2 work on Android without raw sockets

I was exploring the IKEv2 StrongSwan client implementation for Android. What I fail to understand is that Android and Java do not support raw sockets, whilst the IKEv2/IPSec works below the transport ...
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1answer
109 views

Is PFS recommended by the NCSC in the PRIME profile for IPsec

Guidance on the PRIME profile for IPsec (https://www.ncsc.gov.uk/guidance/using-ipsec-protect-data) does not explicitly mention the use of PFS. Is there a recommendation for its use in the Prime ...
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194 views

StrongSwan, IPsec remote certs and cert_policy

I'm looking for a way to limit the certs that my IPsec can accept. I'm using StrongSwan (swanctl version 5.7), I want to accept only certs coming from a remote with a name of yoji.*.example.com I ...
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204 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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58 views

What are the changes in PKI when i move from TLS protocol to IPSec Protocol?

Currently i am using TLS protocol for a secure communication between my server and client. I use PKI for key/certificate Management. If i want to switch to IPsec for secure communication, how will the ...
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1answer
593 views

Which VPN offers more security conceptually, SSL VPN or L2TP/IPSEC?

Aside from possible implementation bugs, which VPN concept aims to offer more protection by design? SSL VPN (implementation example - OpenVPN) L2TP/IPSEC (implementation example - Strong Swan) After ...
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1answer
134 views

IKEv2 Using Different PSKs

We're setting up some new tunnels and have been told to use IKEv2. I understand that IKEv2 allows different authentication methods, e.g. one side using PSK and the other using a certificate. We don't ...
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1answer
115 views

authby=secret serve as alternative to AH in ipsec.conf

I have employed strongSwan U5.5.1 for installing an IPsec tunnel between two Debian hosts with a firewall in between. My ipsec.conf specifies authby=secret but not ah=. The firewall currently permits ...
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Could IPSec flows be decrypted using PSK [duplicate]

I created an IPSec tunnel between two VMs using StrongSwan. It relies on a Pre-Shared Key. I wonder, if this key is leaked, what could an attacker perform? Would he/she be able to decrypt previous ...
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1answer
101 views

IPsec installed algorithms

What happens if a laptop and a server don't have a encryption algorithm in common? Does IPSec abort the connection or does it always have default algorithms?
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573 views

Ipsec: Is it possible to use both pre-shared keys and pubkeys auth methods at the same time?

So if we have a server configuration with local auth pubkeys and remove psk and at the same time for a client(initiator) a local auth psk and remote pubkey. Something like this. Server - local { ...
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IP Encryptor and Firewall

Firewalls implement IPsec VPN and perform packet filtering. IP Encryptor, on the other hand implements IPsec VPN and achieve security goals (confidentiality, integrity and authentication). What are ...
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2answers
81 views

TCP Traffic, SSL or extra Tunnel

I have a situation where we (as a SaaS vendor) are migrating one of our clients away from their local premise to our public SaaS. However as a security concern they want to route all their TCP ...
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1answer
157 views

Is a security association (SA) implemented in ESP and AH protocols?

I'm reading about security associations. I've understood that a SA is a virtual connection between a client and a sever, in which all the security parameters, such as encryption algorithm, IP origin ...
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1answer
784 views

How hard is it to retrieve IKEv2 Server Certificate from the server?

I got access to a VPN via IPsec and IKEv2. The provider gave me a username, a shared secret and a server certificate. Since the certificate was self-signed, the manual came with specific instructions ...
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121 views

IPSec Sniff Traffic

I'm wondering if it is possible to Sniff IPSec connections. At the beginning of a connection, the two peers agree on a SA and exchange a PSK or Certificates. What I'm thinking about, is to ...
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Where would I go to use a reliably secure encrypted internet connection?

Lately, I’ve been paying $100 a month for Fios. I’m thinking of canceling this service because I rarely use my internet at home, since I’m at school most of the time and my college offers internet (...
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2answers
437 views

Maximum number of certificates generated by a CA

What is the maximum number of certificates that can be generated from a CA? The use case is a VPN using certificate authentication and I would like to know what is the theoretical number of unique ...
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1answer
190 views

IKE Phase 1 /w PSK resource?

I can't seem to find a sufficiently detailed resource that describes the IKE phase 1 PSK identity authentication process. They seem to focus on differences between aggressive and main mode while ...
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1answer
76 views

IPsec down with unusual SNMP traffic [closed]

Time to time IPSec tunnel status become down, with unusual SNMP Traffic. when I disable and enable port manually, it become normal. I am using 200E fortigate firewall. Have you any idea or previous ...
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1answer
99 views

IPsec with PSK: Can PSK be used for passive eavesdroping?

I use a PSK to connect to an IPsec VPN. Let's say an attacker can gain access to my PSK. He can then impersonate me, that much is clear. But would she also be able to decrypt intercepted traffic? ...
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2answers
148 views

IPSEC connection attempt to rogue server — is my PSK compromised?

I am setting up an IPSec connection between two sites using Ubiquiti EdgeOS-based equipment. Using a DDNS service (a static IP is unavailable from the ISP), they can be found at east.example.net and ...
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1answer
8k views

Which PFS Group is recommended for IPSec configuration?

I can't find much information on PFS (Perfect Forward Secrecy) Groups so I'm unsure what to suggest for a secure IPSec configuration. Any suggestions on PFS groups that aren't recommended? What is ...
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281 views

What alternatives to IPSec for diversifyed redundancy?

I need to provide redundancy to an IPSec link between two premises. I would like to have no single point of failure and to diversify technologies. What could I use please? Are the following leads ...
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1answer
708 views

Please explain the vulnerability for the pre-shared Key for IKEv1 brute force IPSec

After the vulnerability was released for IPSec IKEv1 PSKs, our organization decided to increase the size and complexity of the PSK. However, upon releasing the new PSK we had a few issues: ...
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1answer
824 views

Why doesn't IKEv2 use L2TP?

My guess is that with IPSec/IKEv1, since it doesn't support NAT, you either have to manually configure routes from your machine, or use a layer 2 tunnel (such as l2tp) to talk with devices on the ...
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2answers
94 views

Do I need Gateway Firewall for IoT network? [closed]

Do I need a gateway firewall to prevent attacks like DoS, if my IoT network can only talk to cloud using IPsec? Even if there is need that can be implemented at cloud. Is there any need for it to ...
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1answer
732 views

How to use IPsec Transport mode between two gateways

I have read many comparisons of IPsec Transport vs. Tunnel mode, and there is a clear understanding that when two gateways are exchanging routed traffic they should use Tunnel mode. In other words, ...
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2answers
10k views

How does Cisco Anyconnect VPN work?

I am looking for a deep down technical explanation of how it works. My understanding is its an SSL VPN and works as follows: - Anyconnect creates a TLS session to the configured remote servers, ...
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1answer
489 views

Differentiating between IKEv2 and OpenVPN Traffic

There is a WiFi network that I regularly use, and it seems to be blocking all VPN traffic other than IKEv2. I tested this by downloading many of the free/freemium VPN apps from the Google Play Store ...
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1answer
431 views

Is IP address whitelisting useful if the IP address is not “secret”?

I'm working on an application that will have access to API keys supplied by our users. The application makes API calls on behalf of our users. The API we're using allows users to whitelist IP ...
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116 views

Disable SSLv3 in IPSec CentosOS

I have been told to shut down support to SSLV3 - TLS 1.0 - TLS 1.1 to all encrypted communications towards external web services. Now, I have an IPSec/CentOS gateway in front of my Data Center.How ...
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1answer
657 views

IPsec Transport Mode NAT Traversal Security Risks

The strongSwan FAQ states: NAT-Traversal with IPsec transport mode has some inherent security risks. What kind of security risks is the documentation referring to? (links to other resources are ...
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2answers
381 views

Why rekey long-lived connections?

Why is rekeying after a certain period of time, or after a certain volume of data transfer, often implemented in modern secure transport protocols such as ESP or TLS? What are the security risks of ...
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2answers
520 views

What is meant by IPSec is “transparent”

While reading a guide on IPSec, i came across this sentence: IPSec is transparent to the user and the applications. Can someone please tell me what is meant by being transparent from security view ...
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3answers
3k views

IP Security (IPsec) vs Public Key Infrastructure (PKI)

I've found the following question on the internet and don't think the answer is right. Which of the following does IPsec use? A) SSL B) AES C) DES D) PKI The given answer is D, PKI ...
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IPSec and traffic mirroring [closed]

I have a VoIP server on which several SIP clients are connected to through IPSec tunnels. This is kind of an automated attendant so I both have RTP and SIP signalling flows. I need to be able to ...

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