Path MTU issue when VPNed in of ASA5510 8.0 (4)

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• VPN IPSec L2L between IOS and PIX 6.3 - MTU issue?

  The side of the remote control (customer) is behind the 6.3 (5) PIX. And the side of the head end (server) is 2911 IOS on 15.0.

  The IPSec tunnel rises very well and passes traffic. However, there is a server which are not fully accessible. Note, it is mainly the web traffic.

  Client initiates a connection to the http://server:8000. They receive a redirect to go to http://server:8000 / somepage.jspa. Package caps show the customer acknowledges the redirect with a SYN - ACK response, but then the connection just hangs. And no other packets are received in return. I noticed that the redirected page is a .jsp and other pages that work OK are not. I also noticed that some MTU and TCP MSS configurations on the side of the head that are in place for another GRE VPN tunnel with another site. So I got in the way of the fragmentation of packets. The side PIX has all the standard configurations of IPSec as well as default MTU on the interface of the inside and outside.

  When the MTU is set manually on the client computer to 1400, the access to the works of http://server:8000 / somepage.jspa very well. So I need to tweak the settings of PIX. I tried to adjust the MTU size on and abroad the interface as well as the parameter "sysopt connection tcp - mss. I don't know what else to do here.

  Here is a summary of the MTU settings on the head of line:

  End of the head:

  int tunnel0 (it's the GRE tunnel)

  IP mtu 1420

  source of tunnel G0/0

  dest X.X.X.X

  tunnel path-mtu-discovery

  card crypto vpn 1

  tunnel GRE Description

  blah blah blah

  card crypto vpn 2

  Description IPSec tunnel

  blah blah blah

  int g0/0 (external interface)

  no ip redirection

  no ip unreachable

  no ip proxy-arp

  Check IP unicast reverse

  NAT outside IP

  IP virtual-reassembly

  vpn crypto card

  int g0/1 (this is the interface to the server in question)

  no ip redirection

  no ip unreachable

  no ip proxy-arp

  IP nat inside

  IP virtual-reassembly

  IP tcp adjust-mss 1452

  HA, sorry my bad. Read the previous post wrong.

  (Note: Yes, the SMS on the tunnel interface should be 40 bytes less than MTU).

  Do not twist the MTU, not for TCP problems (not as the first step), it is safer to play with the MSS. MTU may depend on other things (OSPF for example).

  Make a sweep of a ping with DF bit set with the size (from 1300 bytes for example). By doing this, you want to check what is the maximum size of the package, which you can test through the IPsec tunnel. Once you have this value consider - subtract 40 and this defined as value MSS of the LAN interface (and adjust the value of PIX if you can).

  M.

• Performance issues when coming out of sleep

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  Please run the trace when you encounter the problem

• Windows live mail issue when my wife deleted our email, we lost our files and folders

  Windows live mail issue when my wife deleted our email, we lost our files and folders

  Thank you for visiting the Microsoft answers community site.

  The question you have posted is related to Windows Live Mail and would be better suited in the Windows Live Solution Center.

  Please visit the link below to find a community that will support what ask you:

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  Cody C
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• IOS Firewall (CBAC) + Path MTU Discovery

  I was reading just through the 12.2 T documentation CBAC and saw the section on the icmp inspection and how he wildcards outside IP because no matter what a leap could return it with the responses of time exceeded and inaccessible destination.

  See that made me wonder if this was true for TCP as well, especially in situations that involve Path MTU Discovery. If an internal system initiates an outgoing TCP connection that is inspected by the FW IOS, an external host responds with an ICMP Fragmentation needed but DF Bit set to message, the router will consider this part of the session and send it to the host internal?

  Thanks in advance.

  -Mason

  Mason,

  ICMP by CBAC inspection does not include packets 'package-too-great. Therefore, you must explicitly allow these packages in your ACL for PMTUD to work that the router would not consider these packages to be part of the TCP session and drop them.

  See the link below for the types of ICMP packets supported by CBAC.

  http://www.Cisco.com/en/us/products/ps6350/products_configuration_guide_chapter09186a0080455b0d.html

  HTH,

  Sundar

• Using the tunnel path mtu-search command

  Hello world

  Need to know why to use the tunnel-search path mtu command--if we have the GRE tunnels at both ends?

  Also the same command can be used if we have GRE over IPSEC VPN?

  Thank you

  MAhesh

  You can read the description here:

  http://www.Cisco.com/en/us/docs/iOS-XML/iOS/interface/command/IR-T2.html#GUID-3B831D75-DAD0-472A-AC32-A6A066F71C33

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  And Yes, it applies to GRE over IPsec and is quite a good feature in most cases.

• This program has known compatibility issues when I try to install sql server 2008 in windows 7 X 64

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  Hi DoudyEwais,

  1. How do you try to install SQL server 2008 on the computer?

  2. did you of recent changes on the computer?

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  SQL Server forums

  http://social.msdn.Microsoft.com/forums/en/category/SQLServer/

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  Dear all,

  I have a region of the table which will be created initially five rows and im generating a sequence so that five lines simultaneously. First insertion was smooth without any issue.when I train for the second time, loading the page while it shows 10 records and then the third time, she displays 20 records in the table. He brings the existing record that is inserted into the table. Please get a solution to solve. The script below is my AM insert method

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  Second time when the page loads, the query returns (5 + 5) 10 rows and your code create another 10 rows based on the fetchedRowCount which is 10 this time. All together, it makes 20.

  It is clear now?

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  See you soon

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• Performance issues when you build a large crossroads

  Hello
  
  I have a performance issues when you build a large crossroads.
  
  So here's my situation:
  
  We use Discoverer Plus 10.1.2.45.46c
  Database Oracle 9.2.0.6 on Windows 2003
  OAS 10.1.0.3
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  -J' planned a workbook with 1 single worksheet that takes 2 minutes to run. The table generated in the database to store the results from 19 columns and rows to about 225000 (I know that's a lot, but it is what the customer needs).
  
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  Buy a HP Laserjet Printer. LaserJet printers use toner, which is a dry power rather than the wet ink. These printers may be left in storage for years, opened again and can always print. This would put an end to any concerns about the cartridges or the print heads. The disadvantages of these printers is that, unless you use a single black printer, the cost per page is superior for printing from the Officejet 8610. This path would make printing very expensive photographs, so this is something to be aware of the fi.

  Buy a printer with a system of two-ink cartridge. HP printers with two ink cartridge systems have print heads integrated cartridges instead of the printer. This means that if the cartridge doesn't work over the cartridge can be replaced instead.

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  Please let me know if that answers your question, or if it solves your problems. If so, please click on accept solution. If you appreciate my help, please click on the thumbs up icon. The two icons are below this post.

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  2 are you getting this error when you use a particular program? (Specify the program)

  3. have you made changes on the computer before this problem?

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