denied due to failure of reverse path of NAT

Similar Questions

• ASA5505 SSL AnyConnect VPN and NAT Reverse Path failure

  I worked on it for a while and just have not found a solution yet.

  I have a Cisco ASA5505 Setup at home and I try to use the AnyConnect VPN client to it.  I followed the example of ASA 8.x split Tunnel but still miss me something.

  My home network is 10.170.x.x and I install the VPN address to 10.170.13.x pool I have a Windows workstation running at 10.170.0.6, printers 10.170.0.20 and 21 and inside the router itself is 10.170.0.1

  I can connect from the outside and am assigned an IP address of 10.170.13.10, but when I try to access network resources via ICMP or open a web page, the newspaper of the ASDM shows a bunch of this:

  5. January 27, 2010 | 10: 33:37 | 305013 | 10.170.255.255 | 137. Asymmetrical NAT rules matched for flows forward and backward; Connection for udp src outside:10.170.13.10/137 dst inside:10.170.255.255/137 refused due to path failure reverse that of NAT
  5. January 27, 2010 | 10: 33:36 | 305013 | 10.170.255.255 | 137. Asymmetrical NAT rules matched for flows forward and backward; Connection for udp src outside:10.170.13.10/137 dst inside:10.170.255.255/137 refused due to path failure reverse that of NAT
  5. January 27, 2010 | 10: 33: 35 | 305013 | 10.170.255.255 | 137. Asymmetrical NAT rules matched for flows forward and backward; Connection for udp src outside:10.170.13.10/137 dst inside:10.170.255.255/137 refused due to path failure reverse that of NAT
  5. January 27, 2010 | 10: 33:34 | 305013 | 10.170.0.6 | Asymmetrical NAT rules matched for flows forward and backward; Connection for icmp src, dst outside: 10.170.13.10 inside: 10.170.0.6 (type 8, code 0) rejected due to the failure of reverse path of NAT
  5. January 27, 2010 | 10:33:30 | 305013 | 10.170.255.255 | 137. Asymmetrical NAT rules matched for flows forward and backward; Connection for udp src outside:10.170.13.10/137 dst inside:10.170.255.255/137 refused due to path failure reverse that of NAT
  5. January 27, 2010 | 10: 33:29 | 305013 | 10.170.255.255 | 137. Asymmetrical NAT rules matched for flows forward and backward; Connection for udp src outside:10.170.13.10/137 dst inside:10.170.255.255/137 refused due to path failure reverse that of NAT
  5. January 27, 2010 | 10: 33:28 | 305013 | 10.170.255.255 | 137. Asymmetrical NAT rules matched for flows forward and backward; Connection for udp src outside:10.170.13.10/137 dst inside:10.170.255.255/137 refused due to path failure reverse that of NAT
  5. January 27, 2010 | 10: 33:28 | 305013 | 10.170.0.6 | Asymmetrical NAT rules matched for flows forward and backward; Connection for icmp src, dst outside: 10.170.13.10 inside: 10.170.0.6 (type 8, code 0) rejected due to the failure of reverse path of NAT
  5. January 27, 2010 | 10:33:23 | 305013 | 10.170.0.6 | Asymmetrical NAT rules matched for flows forward and backward; Connection for icmp src, dst outside: 10.170.13.10 inside: 10.170.0.6 (type 8, code 0) rejected due to the failure of reverse path of NAT
  5. January 27, 2010 | 10:33:17 | 305013 | 10.170.0.6 | Asymmetrical NAT rules matched for flows forward and backward; Connection for icmp src, dst outside: 10.170.13.10 inside: 10.170.0.6 (type 8, code 0) rejected due to the failure of reverse path of NAT
  5. January 27, 2010 | 10: 33: 13 | 305013 | 10.170.0.6 | Asymmetrical NAT rules matched for flows forward and backward; Connection for icmp src, dst outside: 10.170.13.10 inside: 10.170.0.6 (type 8, code 0) rejected due to the failure of reverse path of NAT
  5. January 27, 2010 | 10:33:07 | 305013 | 10.170.0.6 | Asymmetrical NAT rules matched for flows forward and backward; Connection for icmp src, dst outside: 10.170.13.10 inside: 10.170.0.6 (type 8, code 0) rejected due to the failure of reverse path of NAT

  I tried several things with NAT, but were not able to go beyond that.  Does anyone mind looking at my config running and help me with this?  Thanks a bunch!

  -Tim

  Couple to check points.

  name 10.17.13.0 UFP-VPN-pool looks like it should be the name 10.170.13.0 UFP-VPN-pool

  inside_nat0_outbound to access extended list ip allow list zero 255.255.0.0 255.255.255.0 UFP-VPN-pool

  Looks like that one

  inside_nat0_outbound to list extended ip access list zero UFP-VPN-pool 255.255.255.0 255.255.255.0 allow

• Path failure reverse that of NAT

  Hello guys,.

  We are having a problem between two ASAs Web VPN. These are two test environments, but we need connectivity between the two to move quantities of lare of data from and to. The ASA at Site 1 (ASA 1) running 8.3 code and the ASA at Site 2 executes code 8.2. The VPN is online, but will not reach the traffic. Site 2 can send but not receive and 1 Site can receive but not send. Errors only I got at site 1 and it's below

  Asymmetrical NAT rules matched for flows forward and backward; Connection for icmp src, dst outside: 10.255.1.100 inside: 172.16.1.20 (type 8, code 0) rejected due to the failure of reverse path of NAT

  Site 1 is a dish network. There is an ASA used as gateway, but the local network is simply a flat class B subnet. No VLAN additional routing, only switches back to eachother on the same subnet. Tursted network is 172.16.0.0/16

  Site 2 is a little more complex. It has a binding to a 6500 Cisco ASA that hosts a FWSM. Networks that have need to talk the VPN is behind the FWSM and is 10.255.1.0/24. I have attached a diagram. The ASA at Site 2 doesn't have a link on the 10.255.1.0, but it has a road to access the network of 10.255.255.x. Currently 2 ASA can see the 10.255.1.0 network with no problems. We need this 10.255.1.0 network to the 172.16.0.0 network via VPN on Site 1.

  When traffic comes from site 2 VPN rises with success, but traffic does not reach. I see newspapers FWSM and ASA showing traffic hitting the two, so I'm confident traffic successfully left Site 2. Site is where I get the above error. When I come from the traffic of the Site 1, I don't see anything on the Site 2 ASA or FWSM. This seems to be a problem on Site A ASAbut's NAT configurations you want that I just post let me know.

  Thanks in advance to all those who help!

  Hello

  You have the crypto_acl of the two extremes? I mean it takes an acl mirrored at both ends and you have the rule no. - nat configured for this?

  Tell your site 1: ASA 8.3

  access-list extended allow ip 172.16.0.0 255.255.0.0 10.255.1.0 255.255.255.0

  network locallan object

  subnet 172.16.0.0 255.255.0.0

  network remotelan object

  10.255.1.0 subnet 255.255.255.0

  NAT (inside, outside) source locallan destination locallan static static remote lan remotelan

  Say your site 2: ASA 8.2

  access-list extended allow ip 10.255.1.0 255.255.255.0 172.16.0.0 255.255.0.0

  access-list no. - nat extended ip 10.255.1.0 allow 255.255.255.0 172.16.0.0 255.255.0.0

  NAT (inside) - access list 0 no - nat

  Concerning

  Knockaert

• Check IP unicast reverse path does not

  I configured the ip ip verify unicast reverse path on a Cisco 2611 runs code 12.3 (26). IP cef is enabled at level global but disabled using the no command of cef of cache to route ip on all interfaces except the interface WAN face (serial 0/0).

  !

  interface Serial0/0

  Description connected to the internet

  bandwidth 768

  IP 100.100.20.10 255.255.255.252

  Check IP unicast reverse path

  no ip redirection

  no ip unreachable

  no ip proxy-arp

  property intellectual accounting-access violations

  NAT outside IP

  route IP cache flow

  no ip mroute-cache

  no fair queue

  No cdp enable

  !

  Whenever I reboot the router, it works for awhile, then no longer works. The traffic meter see ip Unicast RPF drop unexpectedly closed escalating after a few minutes and stays where it stopped.

  Industrial property statistics:

  RCVD: 35015 total, 346 local destination

  format 0 errors, 0 checksum error, 0 number of bad jumps

  0 unknown protocol, 17 not a gateway

  security failures 0, 0 bad options, 0 with options

  Opts: 0 end, nop 0, 0, 0 route open source basic security

  timestamp 0, 0 extended security, road record 0

  0 stream ID, 0 source route strict, alert 0, cipso 0 0 ump

  0 other

  Frags: 0 up, 0 time 0 could not back up

  0 fragmented, fragments of 0, 0 could not fragment

  BCAST: 6 received, 0 envoys

  MCAST: 0 a 0 a received, sent

  Envoy: 265 generated, 23074 transmitted

  Drop: 1 encapsulation failure, 0 pending, 0 without adjacency

  120 none route, 467 unicast RPF, 0 forced fall

  options 0 denied

  Fall: 0 packets with source IP address zero

  Fall: 0 packages with inner loop back IP address

  Can anyone think of a reason it works for a few seconds after starting, and then stops?

  [edit]

  I took out the declaration route ip cache flow thought that was up here the problem, but still no change in the meter.

  There are several ways you can use for the same purpose, here are some examples:

  > LCD

  > Policy Based Routing + ACL (two interfaces, scoring on one, deletion via ACL)

  > MPF 'drop' keyword

  > Black Hole routing (Routes null 0)

  > uRPF

  Each method has its advantages and disadvantages, ACLs and static routes are difficult to maintain and operate. ACL with the keyword "log" is process switched, making it slower.

  Routing black hole works by sending a spoofed traffic (hit the Bogon) to Null0 Null0 being a direct adjacency (sort of the interface) of all routers CEF, it is relatively faster.

  uRPF is commonly used with Blackhole triggered remote routing (RTBH). For example, we manage a large organization with several points of entry into the network. Now you know that your network is under attack from back of Source 1.2.3.0/24 with RTBH, all border routers have active uRPF and there is an internal router, known as a 'Router Trigger. You could inject a route in your area of IGP, something like:

  IP route 1.2.3.0 255.255.255.0 null0 tag 255

  And then all the edge routers would receive this route and with the help of uRPF drop all packets 'source' from the network of the attacker. The process is a little more complicated than that, but I hope you get the idea.

  Concerning

  Farrukh

• After the upgrade to FireFox 30, we can access is no longer internal websites. He gives us 401 - non authorized: access denied due to credentials not valid.

  What is happening on our internal websites used to ask for a window to enter your credentials. This is not is no longer the case.

  It comes immediately gives us a

  401-Unauthorized: access is denied due to credentials not valid.
  You don't have permission to view this directory or page using the credentials you supplied.

  Hello, this is perhaps due to the deactivation of some insecure authentication protocols in firefox 30: https://www.mozilla.org/en-US/firefox/30.0/releasenotes/#whatsnew

  You can try to enter Subject: config in the address bar of firefox (confirmed the message information where it appears) and search for the preference named network.negotiate - auth.allow - insecurity-ntlm-v1. Double-click it and change its value to true.

• I have administrator privileges, but when I run CHKDSK it says access denied due to insufficient privileges.

  I have administrator privileges, but when I run CHKDSK it says access denied due to insufficient privileges. You have to invoke this utility in elevated mode.

  How can I fix it?

  Hello

  1. what prompted to run chkdsk on your computer?

  To work with this problem, refer to these methods.

  Method 1:

  I suggest that you disable the antivirus software temporarily and try to run chkdsk on your computer.

  http://Windows.Microsoft.com/en-us/Windows7/disable-antivirus-software

  Warning:
  Antivirus software can help protect your computer against viruses and other security threats. In most cases, you should not disable your antivirus software. If you need to disable temporarily to install other software, you must reactivate as soon as you are finished. If you are connected to the Internet or a network, while your antivirus software is disabled, your computer is vulnerable to attacks.

  Method 2:

  You can check disk errors using the command-line of the system recovery options in Windows 7.

  What are the system recovery options in Windows 7?

  http://Windows.Microsoft.com/en-us/Windows7/what-are-the-system-recovery-options-in-Windows-7

  To open the System Recovery Options, see the section: to open the menu system on your computer Recovery Options
  

  Important: when running chkdsk on the drive hard if bad sectors are found on the disk hard when chkdsk attempts to repair this area if all available on which data may be lost.

  Check if it helps.

• What is the difference between Unicast RPF and Reverse Path Forwarding?

  I am confused between Unicast RPF and Reverse Path Forwarding function.

  What is the difference between Unicast RPF and Reverse Path Forwarding?

  Because they have all two please check the address of the source of each package before sending it to the destination too?

  Reverse Path Forwarding is used only when the network want to build a tree shared multicast communication and then we must use Unicast RPF after creation of the shared tree?

  The mechanism of the RPF is mainly used to ensure no loop of routing traffic.

  As you probably already read, it does by ensuring that his route to the source address of a packet received is accessible via the same interface that the packet is entered in the. Think of the notion of "root port" in STP. all root ports are similar to the root, sunflower follow the Sun. Therefore, it is naturally a loop prevention mechanism.

  With multicast traffic, it is quite likely to create multiple loops of routing the nature of 'destination' traffic. For this reason, using a mechanism as the RPF to ensure you are on the "road to the root" (to say) to the source originating multicast traffic. Otherwise if you're not then you either receive this traffic route in a loop, or a suboptimal path.

  uRPF works essentially the same way, except that it is done for unicast traffic instead. Now with unicast traffic your flow is from a source and directs to a single destination. Given that, as the fact that you are using a dynamic routing algorithm (which allows to select the path to a destination), you can have loops of your network for unicast traffic flow routing; of course there may be exceptions to pitfalls of configuration route redistribution.

  However RPF when it is applied to traffic unicast can add another advantage, and it's verification IP source. That's why we can use it as a security mechanism to ensure that data are from where it is supposed to come.

  On the limit of the L2, you then have mechanisms such as guard source IP to ensure that the correct host is not usurpation of their IP address.

  By analogy RPF can be used for checking at source for multicast traffic, and it is intrinsically that however, the most important role is so that it can be used to guarantee without loop routing of multicast traffic.

  I hope that helped clear things upwards and not confused you any more with all this.

• reverse path

  I have the command "ip check path reverse interface outside ' configured on my PIX. According to the documentation, the external interface is protected by checking the source address and prevent attacks of penetration. This essentially means that entering my network packets are checked to see if the dest. There is a network in the routing table? Also, if I apply this to my inner interface, it will check that the source IP address is valid inside the interface?

  Just want to double check.

  Hello!

  Yes.

  The investigation period check interface reverse path outside the command statement protects the external interface from the Internet network penetration attacks, while the IP check interface reverse path within the command statement protects the output network interface inside attack users on the internal network.

  HTH.

  Rgds

  Vimal

• Stuck on reverse path

  Someone knows how to fix this? I can't rebuild the paths (theres too may) and I tried to cut and paste inside to a new path and that has not worked. I think the person who built the original path built large and reverse and then cropped the document flush outside the path. Please see attached jpg for more details. I played a bit with the tool edge refine, but this isn't really what I'm looking for. Thanks in advance.

  Select this path with the Selection tool to trace (the black arrow) and in the Options bar, change button to subtract from shape area to add it to the form area

• Aspire 5943g could not start due to failure of the interactive logon process

  When starting my Aspire lap top the message "interactive logon process initialization has failed. For more details, please see the event log"However when 'OK' message, it just returns after 15 seconds so am in a loop of default. When trying to reboot in "safe" mode it shows the same message. I tried pressing the Alt and F10 keys together on first but nothing happens before the message appears. Is there a solution to this failure?

  Press DELETE to enter BIOS start, check whether the HARD drive on SATA devices, then check if the D2D option is enabled, then press F10, save and exit.

  at the next startup, press ALT + F10 and check if Acer erecovery begins.

• access denied. Could not find specified path\file win\sys32\rundll.exe

  Using win xp professional. computer stoped allowing administrative privileges to the owner. I went under safe mode and created another administrator account and it works fine.  However, I can't return permissions owners without deleting his account. I can account to work right? Do I have to remove his account? Does anyone know what caused this problem? How can I stop it happening again?

  In his account, try this:
  Download and then run the file .exe association difficulty http://www.dougknox.com/xp/file_assoc.htm

• Error HTTP 401.2 - Unauthorized: access is denied due to server configuration.__Internet Information Services (IIS) _

  Hope you can help.  A member of the family got a computer for Christmas, they got Microsof Office 2007 student and Home edition 60-day trial.  When you start one of the applications he asked 25 digid product key.  Office was preinstalled on the computer therfore in the folder click DAT trial 60 days ago, but the above message appears.  Thoughts or responses would be most appreciated

  Hello
  Welcome to the Microsoft answers site

  The question you have posted is related to Microsoft Office, and would be better suited to the Office Discussion groups. Please visit the link below to find a community that will provide the support you want.
  http://www.Microsoft.com/Office/Community/en-us/FlyoutOverview.mspx

  It may be useful
  Thanks and greetings
  Support Microsoft-dieng
  Visit our Microsoft answers feedback Forum and let us know what you think
  http://social.answers.Microsoft.com/forums/en-us/answersfeedback/threads/

• CiscoSecure ACS 4.2 could not start due to failure of the services start bit

  There are few services that wasn't able to restart, they are as follows:-

  (1) CSAuth

  Error:-"Windows could not start the csauth on local computer. For more information, see the system event log. If it is

  a non-Microsoft service, contact the service vendor and refer to service 1060 "specific error code

  (2) CSTacacs

  Error:-"Windows failed to start the cstacacs on the local computer. For more information, see the system event log. If it is

  a non-Microsoft service, contact the service vendor and refer to service 1066 "specific error code

  (3) CSRadius = start

  the rest of services like CSAdmin, CSDbSync, case were lit.

  Also I am not able to take the acs system backup of the System Configuration-> ACS Backup and pressing backup now. It shows the msg of error as

  : - CSAuth service must be running to start the backup

  I was referring to the snapshots of the OS itself, but I guess you checked now.

  Do not forget that the case works so you should see logs for services that do not work. Learn about the \CSAuth\logs folder for logs CSAuth and other records for other services that do not work.

  There is a located here very detailed troubleshooting guide:

  http://www.Cisco.com/c/en/us/TD/docs/net_mgmt/cisco_secure_access_contro...

  This guide should help you solve the question if there is no other software on the server to cause trouble. One thing it says who can apply to you is to ensure that the Windows Firewall as connection sharing Internet is not ongoing.

  Because I am familiar with your server, I think you should do the quick test below for if sure there are not taken, which may be crashing the authentication services that you mentioned. In the command line, type "netstat - ano | Findstr Listening-i"and see if or not he has taken open your ports Ganymede + and radius. He will probably return false, but it's worth a check.

  Worst case scenario, you may be able to use CSUtil to back up the database (I'm fairly certain you can back up services that work), install the ACS on a new Windows 2003 server, and then restore. You can use CSUtil to many types of exports and operations as well.

  If you manage to deal with the problem or not, you should speak with the person who is responsible for making backups of your servers and make sure that something like this was coming once again that you can have a quick fix during a maintenance window.

• % 305013-5-ASA: rules asymmetrical NAT matched for flows forward and backward; Connection refused because of the failure of the path opposite. NAT VPN clients problems after that put 8.3.2 to level.

  I've recently updated to 8.3.2 and I have been informed of these NAT changes, but even after reading the https://supportforums.cisco.com/docs/DOC-12569 I am still unable to rectify the communication network 192.168.100.0 VPN with hosts on 172.16.1.0 and 172.16.9.0. VPN clients connect to the external interface, and I try to ping inside and the demilitarized zone, respectable 172.16.1.0 and 172.16.9.0 hosts. VPN client shows that the two previously mentioned networks such as roads of security, but still not to the ping pong.

  # sh nat

  Manual NAT policies (Section 1)

  1 (inside) to the (whole) source static obj - 172.16.9.0 obj - 172.16.9.0 destination static obj - obj - unidirectional 192.168.100.0 192.168.100.0

  translate_hits = 0, untranslate_hits = 0

  2 (inside) to the (whole) source static obj - 172.16.1.0 obj - 172.16.1.0 destination static obj - obj - unidirectional 192.168.100.0 192.168.100.0

  translate_hits = 0, untranslate_hits = 0

  3 (inside) to the (whole) source static obj - 172.16.1.0 obj - 172.16.1.0 destination static obj - 172.16.12.0 obj - one-way 172.16.12.0

  translate_hits = 0, untranslate_hits = 0

  4 (dmz) to (outside) source static obj - 172.16.9.0 obj - 172.16.9.0 destination static obj - obj - unidirectional 192.168.100.0 192.168.100.0

  translate_hits = 0, untranslate_hits = 0

  5 (dmz) to (outside) source static obj - 172.16.9.0 obj - 172.16.9.0 destination static obj - 172.16.12.0 obj - one-way 172.16.12.0

  translate_hits = 0, untranslate_hits = 0

  Auto NAT policies (Section 2)

  1 (dmz), to the source (external) static obj - 172.16.9.5 interface tcp www www service

  translate_hits = 0, untranslate_hits = 142

  2 (dmz) (outdoor) source static obj - 172.16.9.5 - 01 interface service tcp 3389 3389

  translate_hits = 0, untranslate_hits = 2

  3 (dmz) (outdoor) source static obj - 172.16.9.5 - 02 interface tcp ldap ldap service

  translate_hits = 0, untranslate_hits = 0

  4 (dmz) (outdoor) source static obj interface - 172.16.9.5 - 03 service ftp ftp tcp

  translate_hits = 0, untranslate_hits = 0

  5 (dmz) to (outside) of the source static obj - 172.16.9.5 - 04 interface tcp smtp smtp service

  translate_hits = 0, untranslate_hits = 267

  6 (inside) source static obj - 172.16.9.0 172.16.9.0 (dmz)

  translate_hits = 4070, untranslate_hits = 224

  7 (inside) to (dmz) source static obj - 10.1.0.0 10.1.0.0

  translate_hits = 0, untranslate_hits = 0

  8 (inside) to (dmz) source static obj - 172.16.0.0 172.16.0.0

  translate_hits = 152, untranslate_hits = 4082

  9 (dmz) to dynamic interface of the obj - 172.16.9.0 - 01 source (outdoor)

  translate_hits = 69, untranslate_hits = 0

  10 (inside) to the obj_any interface dynamic source (external)

  translate_hits = 196, untranslate_hits = 32

  I think you must following two NAT config

  NAT (inside, outside) source static obj - 172.16.1.0 obj - 172.16.1.0 destination static obj - 192.168.100.0 obj - 192.168.100.0
  NAT (dmz, external) source static obj - 172.16.9.0 obj - 172.16.9.0 destination static obj - 192.168.100.0 obj - 192.168.100.0

  Please configure them and remove any additional NAT configuration and then try again.

• tried to uninstall rdr... not allowed due to the absence of the object file... tried new download... access denied due to lack of file... failed to load any pdf... blocked

  help me find my ability to pdf... puzzled, cannot load a pdf file, uninstall the program or install the new program. Try to print the $60 rebate form. Can't do this or access or print any pdf. Help

  Hi solond,

  Please let me know the version of the operating system installed on your computer?

  If it's a windows computer, please try to uninstall using this Download Adobe Reader and Acrobat tool - Adobe Labscleanup tool, and then restart your computer & install Adobe Reader using this link Adobe - Adobe Acrobat Reader DC Distribution

  Let me know how it goes.

  Kind regards

  Nicos