IPSec is a method to provide internet security over the layer 3 of the OSI model.

learn more… | top users | synonyms

2
votes
1answer
346 views

Relation of IPSec and IPv6 to SSL/TLS

My understanding is that IPSec is a security layer added inside the IP protocol to make IP itself a secure transport. My understanding of IPv6 is that it is the newest version of IP that will (for ...
1
vote
0answers
47 views

IP header “Option field”

Is it true that the GRE (Cisco tunnel) header is placed in the IP header "option field" ? Are the IPSec headers (ESP or AH) installed in the "option field" too ?
4
votes
1answer
5k views

How to use IPsec?

IPsec is a protocol suite built on top of IP. Originally designed with IPv6, it also exists in IPv4. IPsec enables encrypted communications between hosts at the IP level (that is, upper layers ...
0
votes
1answer
1k views

Openswan L2TP/IPsec VPN for iPhone fails during connection

I spent the morning trying to configure an L2TP/IPsec VPN using Openswan and xl2tpd on a Debian Squeeze server for use by a mix of iOS and Mac clients. I am trying to set it up using pre-shared keys ...
1
vote
1answer
697 views

How do I configure a Netgear FVS336g for use with Amazon VPC?

I think it should be possible to create an IPSec tunnel between a Netgear FVS336Gv2 firewall/router and AWS VPC however, I've been unable after several tries. How do I setup a connection for a Amazon ...
2
votes
3answers
769 views

IPv6 and IPSec - why do I need an external daemon?

I read that IPSec is mandatory for IPv6 implementations. Does this mean that it should be handled by the OS and that IPSec configuration should be mandatory for IPv6 to work? If so, why is this not ...
0
votes
2answers
114 views

IPsec counter mode - are there implementations?

Counter mode encryption is potentially more robust against lost packets. It is used in SRTP. I assume that if I use counter mode, a lost packet causes a lost UDP packet or TCP retransmission instead ...
1
vote
1answer
230 views

OS X: how to figure out what prevents L2TP/IPSec from running correctly

It seems that an old installation of Cisco Anyconnect prevents the OS X built-in L2TP/IPSec client from running (I posted a question here: OS X 10.7, can't log into any L2TP VPN server, but didn't ...
14
votes
2answers
23k views

Cisco IPsec versus L2TP/IPsec

I have a VPN service which gives me the option of connecting via PPTP, Cisco IPsec, or L2TP over IPsec. PPTP i know is inferior in terms of security and encryption, but I'm not really sure what the ...
1
vote
1answer
618 views

Can IPSec (or any other VPN tunnel) hide your IP address while browsing?

Is there a VPN/tunnelling method which you can use to browse the web, but will also prevent somebody from seeing your IP address if they were sniffing the network? I wasn't sure if the IP address ...
0
votes
3answers
358 views

Something regarding internet browsing using an IPSec VPN?

Something is causing me a real headache: If my workplace offered a wireless internet connection, at the workplace, using VPN (assume it's IPSec for now). If I were to connect, I presume on the other ...
1
vote
0answers
648 views

PFsense OpenVPN traffic getting routed through WAN rather than IPsec tunnel

So I have a PFsense firewall setup with a IPsec tunnel created to access a special webpage housed at another companies website. Internal traffic routes properly through the IPsec tunnel for this ...
0
votes
1answer
781 views

Private IP address over IPSEC tunnel

I have two dedicated servers that I have configured to require AH and ESP between their (public) IP addresses and using racoon I've set up isakmp. The IPsec tunnel between them is working well - I ...
6
votes
2answers
4k views

How to auto save a Cisco VPN connection password on Mac OS X?

I have set up a Cisco IPSec VPN connection instead of using the Cisco client on Mac OS X. I like it fairly well, it just sits in the tray next to the clock and allows me to easily connect and ...
0
votes
1answer
1k views

will the left|rightfirewall option of StrongSwan open UDP 500/4500 and protocol number 50 on iptable?

I know the StrongSwan use UDP 500 and 4500 for IKE traffic and IP protocal number 50 for ESP packages. I am not sure the usage of left|rightfirewall ...
1
vote
1answer
234 views

VPN back to home network for secure IP traffic?

I'd like to set up a VPN running somewhere on my home network that would enable me to securely tunnel all Internet traffic through it from an untrusted network. That way, I could browse sensitive ...
2
votes
1answer
2k views

IPSec-Tools build on Ubuntu

I am trying to build ipsec-tools package from http://ipsec-tools.sourceforge.net/ on Ubuntu PC. I build the package with: $ ./autoreconf --force --install $ ./bootstrap $ ./configure ...
0
votes
2answers
741 views

Macbook Pro unable to use the internet while connected to IPSec VPN

Short Question Is there something I am missing when setting up a Cisco IPSec VPN connection that redirects all traffic over the VPN? Background When I am connected to the VPN, I can browse our ...
1
vote
1answer
128 views

Is Windows IPsec really needed when using a 3-rd party Firewall?

I have installed COMODO Firewall and I have some knowledge about internet security and i set up my firewall rules so my computer is protected enough (that really doesn't matter in current context). ...
2
votes
2answers
3k views

How to connect to an IPSec VPN through a LinkSys WRT54GL?

I am having trouble connecting to a L2TP IPSec VPN when I use my wireless router. I have a LinkSys WRT54GL v1.1 wireless router with the most current version of tomato (1.28). I have no issues ...
1
vote
1answer
778 views

Why is xl2tpd / pppd adding a route for 192.0.0.0/8 after bringing up the link?

I am establishing an l2tp connection with IPSEC between two hosts and when the link comes up a route is added on the client side for 192/8 pointing out the newly established ppp interface. I can find ...
0
votes
1answer
4k views

setup L2TP on Ubuntu 10.10

I'm following this guide to setup a VPS on my Ubuntu VPS: http://riobard.com/blog/2010-04-30-l2tp-over-ipsec-ubuntu/ My config files are setup as in that guide, openswan version is 2.6.26 I think.. ...
1
vote
2answers
583 views

How often is IPsec used in IPV4 networks?

If I disable it on my computer will I lose anything?
1
vote
4answers
783 views

Tor over IPSEC or IPSEC over Tor? [on hold]

Do you think Tor should be run over IPsec, or IPsec over Tor? Please be specific as of why you made this decision.
1
vote
4answers
13k views

Connecting to a Checkpoint VPN-1 from Snow Leopard?

Checkpoint SecureClient doesn't work with Snow Leopard, so I've been looking for some other options. VPN Tracker appears to work, but lacks username/password (XAUTH RSA) authentication support (PSK ...
2
votes
3answers
1k views

Windows 7 RTM IPSec VPN

I'm running Windows 7 Ultimate RTM 64Bit and need an IPSec VPN client, I've tried Shrew VPN but that caused a BSOD. I've noticed there is a VPN option in the start menu but I'm not sure if it is ...