IPSec overhead

Similar Questions

• How IPSec Overhead effects MTU?

  Hello

  I saw all the abilities/combinations of IPsec with different security algorithms and modes, but I have the question, what level of overload is finally added to a package and how it effects MTU (e.g. the value of the MTU for an Ethernet frame is 1400 bytes) in each case?

  Since it varies I don't know how to answer. Here's a great article explaining...

  http://www.iphelp.ru/doc/3/Cisco.press.Comparing.designing.and.deploying.VPNs.Apr.2006/1587051796/ch07lev1sec4.html

  If you did not know:

  You can test the mtu with the ping command. #ping 192.168.0.1 size 1423 df - bit

• Package IPSec - SHA256 digest size calculator?

  Hello

  I recently discovered the IPSec packet size calculator in this forum (see attachment).

  It is very useful calculate overhead when using IPSec, esp. DMVPN.

  Unforunately it contains no options for the following hashes:

  Hmac-sha256-ESP the ESP by using HMAC-SHA256 auth transformation

  The ESP by using HMAC-SHA384 auth hmac-sha384-ESP processing

  The ESP by using HMAC-SHA512 auth hmac-sha512-ESP processing

  Where can I get information on how great collection will be when you use 'hmac-sha256-esp' in my game of transformation?

  Someone is able and willing to implement these new options in the calculator?

  Thank you

  This has just been released a week ago:

  https://cway.Cisco.com/tools/IPSec-overhead-Calc/IPSec-overhead-Calc.html

  Thank you

  Wen

• GET overhead VPN

  Hi all

  We are looking for overhead represented due to GET VPN. Is there a table of comparison or the value.

  Thank you

  Concerning

  Anantha Subramanian Natarajan

  Anantha,

  As mentioned by Lloyd, GETVPN the new IP header is a copy of the original IP header. So, who's going to be 20 bytes (without options). Please keep in mind that the size of the package may vary depending on the options of encryption and authentication as AES, SHA, etc.. Basically, around 52 to 56 bytes. Thus, with the new IP header, looking at 72 to 76 bytes.

  I will quote the ESP RFC 4303 for more details.

  I have not seen a document of specific performance GET VPN on cisco.com. But, since the Original IP header is copied and placed in front of the ESP instead of a new IP as the traditional IPSEC header, I don't think he'll be a lot of difference in the performance of encryption between traditional and GET VPN.

  I hope it helps.

  Kind regards

  Arul

• VTI and NAT IPsec Tunnel mode

  Hello world

  I don't know that this subject has been beaten to death already on these forums.  Nevertheless, I have yet to find the exact solution, I need.  I have three machines, two routers and an ASA.  One of the routers sits behind the ASA and I have a GRE VTI configuration between two routers with ASA NATting, one of the routers to a public IP address.  I can guarantee the tunnel mode IPsec transport, but as soon as I pass in tunnel mode, the communication fails even if the SA is established.

  Please see the configuration below and tell me what I am missing please.  I changed the IP addresses for security.

  The following configuration works when transform-set is set to the mode of transport

  Note: The Router 2 is sitting behind the ASA and is coordinated to the public IP 200.1.1.2

  Router 1:

  Crypto ipsec transform-set SEC esp - aes 256 esp-md5-hmac

  tunnel mode

  !

  Crypto ipsec IPSEC profile

  transformation-SEC game

  !

  !

  interface tunnels2

  IP 172.16.1.1 255.255.255.252

  tunnel source 200.1.1.1

  tunnel destination 200.1.1.2

  Ipsec IPSEC protection tunnel profile

  !

  SECURITYKEY address 200.1.1.2 isakmp encryption key

  !

  crypto ISAKMP policy 1

  BA aes 256

  md5 hash

  preshared authentication

  Group 2

  ASA:

  public static 200.1.1.2 (indoor, outdoor) 10.1.1.1 netmask 255.255.255.255

  Router 2:

  interface Tunnel121

  address 172.16.1.2 IP 255.255.255.252

  IP nat inside

  IP virtual-reassembly

  tunnel source 10.1.1.1

  tunnel destination 200.1.1.1

  Ipsec IPSEC protection tunnel profile

  !

  Crypto ipsec transform-set SEC esp - aes 256 esp-md5-hmac

  tunnel mode

  !

  Crypto ipsec IPSEC profile

  transformation-SEC game

  !

  SECURITYKEY address 200.1.1.1 isakmp encryption key

  !

  crypto ISAKMP policy 2

  BA aes 256

  md5 hash

  preshared authentication

  Group 2

  There is no access-lists on the SAA except to allow a whole ICMP

  I am very grateful for any guidance you can provide in advance guys.

  Hello

  MTU, and the overhead was in this case.

  You changed encapsulating ipv4 instead of LIKING - which have less overhead (no GRE inside). This is why it started working.

  If you want to continue using GRE you decrease the MTU as described.

  ---

  Michal

• Performance - GRE over IPSec or without free WILL

  Looking at the configuration of a VPN L2L tunnel between two sites for voice only traffic.  Ask yourself if the configuration of GRE to the IPSec VPN tunnel would add a charge to the performace of the vs configuration voice traffic just an IPSec VPN tunnel?

  You wanted to set up a WILL for future where we might want to add several tunnels and enable EIGRP routing.

  Please any advice would help.

  Karim,

  First GRE (oIPsec) is not the only option. You also VTI, which does not add the GRE overhead and can run on top routing protocols.

  In terms of raw processing, yes GRE encapsulation is indeed a new step on the way, but most platform today are able to handle this in CEF (or similar) or in the material (usually with some limitations) as on 6500 etc..

  Purely for the voice there should be no impact on the performance (also depends on how you measure performance) since fresh added generals will not change much for audio real, no added encapsultation will add a lot of delay.

  However, there are other things to consider (like how to install QoS is not to present the jitter).

  M.

• integrated macOS Sierra Cisco IPsec VPN does not work anymore (impossible to validate the server certificate)

  Hello

  I just upgraded to macOS Sierra and built-in Cisco IPsec VPN no longer works. When you try to connect, I get a "cannot validate the certificate of the server. "Check your settings and try to reconnect" error message. I use Cisco ASA with self-signed certificates and everything worked fine with previous versions of OS X.

  Please help me, I need my VPN Thx a lot

  I am having the same problem with StrongSwan and help cert signed with the channel to complete certificates included in the pkcs12 file imported to the keychain. It was working properly in El Capitan, but now broken in the Sierra.

• Mac Book to overhead.

  How can I connect my Mac Book to an overhead projector?

  You will need the appropriate adapter and cable.

• When I connect my iPod to iTunes it says the storage overhead but it says on the iPod 8 GB available

  Please help me with this

  Looks like you have iTunes configured to synchronize automatically when a device is connected and you have iTunes configured so that one tries to synchronize media more to the iPod as the storage space available on the iPod.

  Check your synchronization settings:

  iTunes: synchronization of multimedia content for iPod and iOS devices

  https://support.Apple.com/en-us/HT201253

  Try the synchronization using the manual method

  Managing content manually on iPhone, iPad and iPod

  https://support.Apple.com/en-us/HT201593

  The error message really says the 'storage overhead '?

• AC100 - no VPN L2TP/IPSec PSK available

  Android 2.2 (Froyo) devices show for VPN connections the following possibilities: PPTP, L2TP, PSK L2TP/IPSec and L2TP/IPSec CRT (checked on several brands of smartphones).

  The AC100 appears only from any PPTP and L2TP, so not L2TP/IPSec.

  No idea why they are missing, and how to fix this?

  Need for L2TP/IPSec to a VPN with a Sonicwall 3060/Pro.

  Here is a description how to connect: [https://www.fuzeqna.com/sonicwallkb/consumer/kbdetail.asp?kbid=8658]

  Hello

  AFAIK the L2TP/IPSec is only available for android devices routed.

  So maybe it's the reason why the L2TP/IPSec in unavailable for AC100.

  I found here a beautiful Android L2TP/IPSec VPN HowTo
  http://blogs.nopcode.org/brainstorm/2010/08/22/Android-l2tpipsec-VPN-mini-HOWTO/

  Maybe it might help a bit!

• IPsec site to Site VPN on Wi - Fi router

  Hello!

  Can someone tell me if there is a router Netgear Wi - Fi that can form IPsec Site to Site VPN connection between 2 Wi - Fi routers via the WAN connection?

  I know that this feature exists on the Netgear firewall, but can you have the same function on any Wi - Fi router?

  See you soon!

  Michael

  I suspect that.

  Thank you very much for the reply.

  See you soon!

• IPsec over HTTPS

  Is there a way to create an IPSec connection on port 443 (for example if the UDP Port 500 is blocked by outside firewallrules). I noticed some other routers are able, or if it will support on Netgear UTM in futured upgrades?

  Thank you...

  Never. 500 is integrated with IPSec.

  You can use SSL VPN to 443.

  You see what routers supporting VPN IPSec on 443?

• Cisco IPsec VPN

  Has anyone this configured with the models in the phone and/or imported their own models? Is this even work?

  It happened to be that I was testing with IKE authentication XAuth disable the tunnel group so I didn't have to type a user name and password each time. I decided to activate just to make more apples to apples for my group of main tunnel and put back it in the model. I also took some anti-replay when I was scouring the template that I downloaded here. I also tested it works with RSA authentication, where you put your PIN with the password and then when you want to connect simply add your id to token at the end.

  model 'Test' {}

  1.1.1.1 gateway address;

  the host pre-shared authentication;

  ipsec tunnel mode.

  IKE-parameters {}

  user authentication;

  aggressive-mode;

  version 1;

  3des-cbc encryption.

  integrity of the hmac-md5-96 code;

  Group modp-1024;

  life 86400;

  }

  IPSec-parameters {}

  3des-cbc encryption.

  integrity of the hmac-md5-96 code;

  perfect-front-secret;

  anti-replay;

  life {type kilobytes; value 28800 ;}}

  }

  }

• Model IPSEC not no projection in web registration

  Nice day

  I have an edition of Windows 2003 R2 Server Standard with a turnover of the company and is an AD DC. My question is... the model of IPEC is not in the drop-down list of web registration.

  The IPSEC model has all the permissions in the Security tab for full control Domain Admins.

  Reason, I need the model IPSEC is that I am creating a site to site ASA VPN using the IKEv2 certificate authentication so I need a certificate of identity.

  Thank you

  Dana Burton

  Hi Dana,

  I suggest you to ask your question at the following link.
  http://social.technet.Microsoft.com/forums/en-us/w7itpronetworking/

• Overhead of the graphic use of Wfm as a Subvi output terminal?

  -My basic question:
  If the front is closed, is there a difference between a graph of Wfm and Wfm indicator as output terminal?

  -The question in context:
  I have a no reentrante Subvi, which will take place in my program and an output waveform.  Sometimes, I want to open the front of the Subvi and adjust its internal settings displaying its output on a graph of Wfm.

  The minimum solution would appear to make the graph of Wfm of the Subvi double panel as the output terminal, as opposed to the output through an indicator of Wfm.  But who would increase the resources used during normal operation of the Subvi?

  Thanks in advance and have a nice day.

  -Brad

  There should be no overhead. The chart would update only if the front is open. Most of the time, there are not yet signs before the subVIs in memory.

  Mike...