Cisco VPN :: 3000 - Reverse Lookup Is Not Working Over L2L Tunnel

Mar 6, 2012

I have Cisco VPN 3000 in main office which provides VPN tunnel to the remote site (PIX 506). In main office we have Domain Controller as well as DNS/DHCP servers.I ran into the issue where DNS reverse lookups are not working from main office to the remote computers:
ping - works fine from main office and resolves to appropriate IP address ping -a IP address - from main office returns
From the remote computers, both forward and reverse lookups are working fine.

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Cisco Security :: Establish A Tunnel (LAN-to-LAN) From A VPN 3000 Series?

May 31, 2001

Is it possible to establish a tunnel (LAN-to-LAN) from a VPN 3000 series Concentrator with a static IP address to another VPN 3000 series concentrator (or an IOS router) with a dynamic IP address.

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Cisco VPN :: 3000 To 2611 IPSEC Tunnel Failing

Aug 16, 2011

Phase1 is complete, Phase2 isn't coming up...everything has been verified on both sides but we're getting unknown errors.
Aug 17 11:33:15.609 CDT: ISAKMP (0:2): Old State = IKE_QM_READY  New State = IKE_QM_I_QM1
Aug 17 11:33:15.609 CDT: ISAKMP (0:2): Input = IKE_MESG_INTERNAL,


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Cisco VPN :: VPN 3000 Setting Two Concentrators At Different Sites To Create Ipsec Tunnel

May 20, 2011

I'm currently setting up two VPN 3000 Concentrators at two different sites to create a IPsec LAN-to-LAN Tunnel. I have gone through all the basic configuration guides on the CISCO site, but a LAN-to-LAN session is never created. I have enabled the logs on the Concentrator and it displays no errors at all - it appears the Concentrator is not even trying to establish a IPsec LAN-to-LAN Tunnel.After running through the standard setup provided by CISCO, is there anything I need to do to make the Concentrator try to create a Tunnel, or should this be automatic once all settings are in place?

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Cisco VPN :: 3000 Network Address Is Allowed Down Tunnel / Check Phase 2 IPSEC Proposal

Nov 4, 2012

I need to check and possibly change which Network address is allowed down a tunnel and check our Phase 2 IPSEC proposal. How would I do this on a VPN3000?

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Cisco :: DHCP Autoconfiguration Not Working On IE-3000

Jun 5, 2013

I have a Cisco IE-3000-8TC running 15.0(2) EY1 IES-IPSERVICESK9-M. I am trying to configure the switch to auto configuration (download only the configuration file and not the software image) via DHCP from a combination DHCP/TFTP server. When I configure the switch with the commands (on initial configuration): Code...

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Cisco VPN :: ASA 8.2 / No Split Tunnel / NAT For Internet Not Working?

May 27, 2013

I'm configurig a VPN profile with NO split tunneling. The tunnel is working to the inside, but I'm not able to get internet access. Below are the NAT statements that I created.
nat (outside) 2
global (outside) 2 (ip address) 
I'm familiar with 8.6 nat statements, but with 8.2 it's not letting me put in the same commands.

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Cisco Firewall :: ASA 5510 - Vpn Tunnel Not Working From One End

May 9, 2013

I have an ASA 5510 and I am building a site-to-site vpn tunnel, peer on the other end is a sonicwall. I can initiate the tunnel from my end, but when he tries from his end it fails on phase 2 with this error in the logs:
"Rejecting IPSec tunnel: no matching crypto map entry for remote proxy"
Obviously our crypto map's don't match, i have it restricted to specific ports on my end and he had it wide open on his end, but said he is not sure how to restrict it down to specific ports. My question is why would I be able to bring the tunnel up on my end if the crypto map's don't match and he can't bring it up?

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Cisco Firewall :: VPN Tunnel Not Working From One End ASA 5510

Dec 5, 2012

I have an ASA 5510 and I am building a site-to-site vpn tunnel, peer on the other end is a sonicwall. I can initiate the tunnel from my end, but when he tries from his end it fails on phase 2 with this error in the logs:
"Rejecting IPSec tunnel: no matching crypto map entry for remote proxy"
Obviously our crypto map's don't match, i have it restricted to specific ports on my end and he had it wide open on his end, but said he is not sure how to restrict it down to specific ports. My question is why would I be able to bring the tunnel up on my end if the crypto map's don't match and he can't bring it up?

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Security / Firewalls :: Lan To Lan Vpn Tunnel Is Not Working

Feb 12, 2012

I have problem with the Lan-to-Lan VPN tunnel.the VPN working fines since 9 months ago without any problems.Suddenly got the problem!,In last two days we faced problem the VPN first time the problem in phase-2.. but after that in phase-1... in latest no data packet received to their side.

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Cisco Routers :: RV082 Split Tunnel Not Working?

Aug 21, 2012

I have a RV082 v2 with Firmware with a Site-to-Site VPN to a Cisco ASA5510.
The PCs behind the RV082 can not see two webservers behind the ASA5510. Both servers have full DNS registration and are accessable from other sites with RV042 routers.

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Cisco Routers :: RV220W IPSec Tunnel Not Working

Sep 26, 2012

We have 2 RV220W Routers installed in seperate offices. We are attempting to setup a IPSec tunnel between the two sites. So far we have been unsuccessful in getting this to work.On both sides, we are getting a successful connection established, but netiher site is recieving any packets. Both sides are transmitting packets though. We have exhausted our resources trying to figure out why.

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Cisco Firewall :: 5520 - VPN Tunnel Not Working Properly?

Jan 11, 2012

I am getting the below  messages in my cisco asa 5520, during this time tunnel is down. just what to check whether the problem is at remote FW or with asa


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Cisco VPN :: PPTP Tunnel To Linksys RV042 Not Working Through 2620 Router

Jan 9, 2012

I have a remote location that has a Linksys/Cisco RV042 router [URL] that allows PPTP connections based on username and password combinations. There are no intermediary routers between this device and the internet - only a DSL modem. A secondary WAN connection is not present.
I am able to dial into this VPN using the Windows XP and Windows 7 dialers from any of my local free-wifi locations(e.g. Starbucks). I WAS able to connect to this VPN connection from my house when my home router was a Buffalo brand router.
I have replaced the Buffalo router with a 2620(non-XM) that is connected in ROaS fashion to a 2950 switch. I need some guidance on what in my config is not allowing me to connect to this remote site.
Home network info: Local subnets : 192.168.x.x
Remote network info: Local subnet : 10.214.x.x
The Windows XP dialer client indicates that the username and password challenge is where the connection fails. It ultimately gives me the error code 619. I have performed a Wireshark packet capture of an attempt to connect from ip This packet capture shows multiple "Configuration Request" packets being exchanged between the two endpoints, but does not ever show an exchange of authentication.
My nat translation table shows an entry for both a GRE tunnel as well as port 1723 between and the WAN port of the RV042 when attempting to establish this VPN.
I have attached my 2620 configuration for your review.

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Cisco VPN :: Strange Syslog Entries After VPN Tunnel Stops Working 892s

Dec 15, 2011

I have a VPN tunnel between two 892s. When either ISAKMP or IPSec SA lifetime expires tunnel stops processing traffic. However nothing is logged in the syslog. But when I enable debug crypto isakmp error and debug crypto ipsec error following entries appear:
ISAKMP:(0):Can't decrement IKE Call Admission Control stat outgoing_active since it's already 0
ISAKMP:(2041):R-U-THERE-ACK sequence number 0x63D809BB does not correspond to expected value 0x63D809BC
%CRYPTO-4-RECVD_PKT_INV_SPI: decaps: rec'd IPSEC packet has invalid spi for destaddr=XX.XX.XX.XX, prot=50, spi=0x3560099E(895486366), srcaddr=YY.YY.YY.YY, input interface=GigabitEthernet0
ISAKMP:(2043): IPSec policy invalidated proposal with error 4

Is this a bug? IOS is Cisco IOS Software, C890 Software (C890-UNIVERSALK9-M), Version 15.1(2)T2, RELEASE SOFTWARE (fc1)

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D-Link DIR-825 :: Firmware 2.05NA - How To Get IPv6 In IPv4 Tunnel Working

Jun 9, 2011

I have a Dlink DIR-825 B1 with firmware 2.05NA.  I recently reset it to factory defaults to make sure I didn't misconfigure something.

I have been struggling to get a IPv6 in IPv4 tunnel working with  I think the issue is a problem with the router itself and i'm not sure how to get it fixed.

All of my machines were getting IPv6 addresses (both windows, mac, linux) but none of them seemed to work.  All I was able to do was ping the gateway itself using the local lan address.  In each case they were missing a default IPv6 route.  If I added a default route then it would work.

I started looking at the packets using a network sniffer and the Router Advertisements all had a Router lifetime value of "0" which is RFC4816 speak for "don't use this router as the default router".  So Windows/Linux is exactly right by not setting a default route.  

The strange thing was that when I reboot the router I would briefly get a router advertisement with a lifetime of 1800s, the corrert prefix and dns server but then another router advertisement would come along 5 seconds later with a router advertisement of 0.

I have TCP' Other observations

... using 6to4 I would get working IPv6 address.  The difference again seemed to be the Router Lifetime.  But I want to use a permanent tunnel.  I have found 6to4 unreliable.

... the router never responds to router solicitations.  It only sends a router advertisement when it wants to.

... the router never responds to DHCPv6 when that is configured.

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My DNS Lookup Failed

Mar 11, 2013

I been having trouble with my pc ... it looks like it wants to load the page and takes forever and then it says DNS lookup failed ... sometimes it loads but I have to keep trying until it does load.. It's a Windows XP

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Cisco Switching/Routing :: 2821 - Router VPN Client Split Tunnel Is Not Working

Mar 14, 2013

i've configured Cisco VPN CLient on a router 2821, and it is working fine.I could access inside resourses normally>the problem is that when i connect with VPN i lost connectivity to internet? What is wrong with my configuration? Below the running config of the router.
CISCO2821#sh run
Building configuration... 
Current configuration : 5834 bytes
version 12.4


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Cisco :: RV016 DNS Lookup Failure

Apr 19, 2012

I manage a small business with 10 computers running off my network. They are all connected to the internet through a RV016. We recently created a new website and purchased a new domain through In Motion Hosting. I have a randomly reoccuring issue, usually in the morning, that seems to resolve itself after a couple hours on it's own. I have dealt with tech support from In Motion Hosting and my ISP who have both come to the determination that the problem lies within my gateway.
When I attempt to log on to my companies website [URL] my browser is unable to locate the webpage. Also, if I try to access the website for In Motion Hosting [URL] or to access our webmail [URL]I am unable to do so because the DNS lookup failed. I can view any other web page on the internet without a problem. I can not ping or tracert either website successfully, however when I called In Motion Hosting and got the IP addresses for the two I was able to ping and tracert them without a problem.
As I said the problem happens randomly and seems to resolve itself within 2-8 hours. However we are unable to access our email during these "blackouts" which is becoming a huge problem.
Is there a setting within the RV016 that might be causing this to happen?

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DNS Lookup Error While Downloading?

Jul 7, 2011

whenever I start downloading any large file I start getting DNS lookup errors from Chrome. I can still download the file and even connect using TeamViewer so I am still connected to the internet is some fashion. My roomate is connected to the same network wirelessly and has not had the issue yet. I am currently connect directly to the router which a Belkin.

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Lookup IP Address From Username

Jan 4, 2013

I want to find out what machine a user is logged into on a local network. The syntax should be something like :lookup user@domain dns.just not sure what flags to pass?

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System Keeps Saying DNS Lookup Failed

Sep 26, 2012

So I just got a new Acer ultrabook and it was working fine until a few days ago. It keeps saying the DNS lookup failed. I've tried everything I can. I made sure it wasn't chrome, doesn't work in Firefox. Reset the modem, did a DNS dump, set the DNS to a 888thing. Utorrent is connecting to the internet fine and I can connect for random periods of time. If I do trouble shoot over and over eventually it starts working. Everyone else in my house gets internet even my sister with the same computer and model.

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DNS Lookup Failed On All Web Browser?

Oct 24, 2011

dns lookup failed, on all web browser (IE, Google, Firefox). I did ip and winsock reset, did networking ins safe mode, it will ping my ip address but will not ping any other address. My computer (running Vista home premium) says that I have internet access but it does not work. This happened on one computer and then on another one about 6 days later and they both are wired to a router.

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Repeated DNS Lookup Failures?

Nov 8, 2012

My netbook keeps getting DNS Lookup Failure messages. This happens about every 20 minutes, give or take, though sometimes it can go longer before the failure. I can "solve" the problem by quickly repairing the network connection, but that's tedious. It happens only on my laptop and not on my housemate's desktop (wired connection) though he did say that it happens to him on his laptop as well. In looking around I thought the problem might be because i'm using Chrome, but it happens on Firefox and Opera as well.

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No Internet Access - DNS Lookup Failed

Oct 13, 2011

My WLAN has been working fine for the past 6 months. Recently it started connecting and disconnecting itself. ANd now it will only connect to the network but wont give internet access. I can connect to the same router using an ethernet cord. And I can connect to the wireless network using my phone or other computer. There are no driver updates for my network adapter, and I tried reconfiguring the router. That worked for a short period of time, but now I have the same issue. I tried a system restore back to before a recent virus software update to see if maybe that update was causing the firewall to block something.

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Opened Chrome And DNS Lookup Failed?

Aug 28, 2011

whenever i open chrome or anything i get DNS Lookup failed.

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Internet Just Went Out Webpages Says DNS Lookup Failed

Feb 15, 2013

Well first of all id say im pretty good at these types of things as they have happened to me so many times. But i cant figure this one out. Yesterday my internet just went out. All of the lights on the modem are still on everything says it should be connected but just doesnt work. When i try to open webpages it says DNS Lookup failed. Called tech support they are sending me a new modem atm, but i have 2 other ones around that i have tried and they say that im connected to the internet, but nothing same lookup error and everything so i do not think it is the modem. Flushed dns, manually entered the isps dns , Dont know what else to try at all.

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DNS Lookup Failed With A Wireless Repeater

Jun 3, 2011

Iv had this problem with two wireless repeaters now. when im connected to just the router, i am able to access the internet. however when i plug in and set up the wireless repeater ( the latest one is a amped wireless sr300) it works for a few min and then i get a "DNS lookup failed" when trying to access sites. this repeater replaced a hawking hwren1. which would work for a few min and then lose the network.i believe this is a problem with our internet connection into the house, but could it be a caused by the router? (wrt400n) our isp says its not their problem and that its our router, but this is the 4th one in under a year.

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DNS Lookup Failed / Server Not Responding

Dec 20, 2011

I have a Windows XP laptop and a Windows 7 desktop. The desktop has no wifi support, I had built it myself. To get internet on my desktop (used for games), I had connected my laptop to the pc, and the laptop picked up wifi from my AT&T gateway in another part of the house. ( I can't move the gateway currently) I have been wanting to connect the desktop to a router/repeater/bridge that would pick up my gateway signal, therefore eliminating the use of the laptop. I also have an Xbox right next to the pc, so I din't want to get an adapter because then I would have to purchase two, so I picked up a a wireless n router with 4 ethernet ports. ( then I could connect both systems using 2 ethernet cables) [URL] I knew when purchasing the router that it had repeater/bridge support. Currently, I have it configured as a wifi bridge. I can connect to it via my laptop, on the wireless networks page, it shows my gateway signal, and the bridge/router, so I connect to the router. It says I have excellent connection, but I can't connect to the internet? Using Google Chrome, it says DNS lookup failed. I can't get on any website, only the router's config page, which is I also connected the router to my pc, and when troubleshooting it says DNS server not responding, may be non existant or incorrect?

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Error Message On All Browsers - DNS Lookup Failed

Dec 31, 2012

Whenever I try to goto a webpage within any browser,despite me being connected to my network(though 1 received packet to every 20 or so sent packet ratio) it tells me that DNS lookup failed. I had a similar issue on my other pc that I use more often,though connecting through WIFI momentarily resolved the issue,before I returning to wired,where everything has been fine. My other pc however has no wifi adapter. So ive been stuck.

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Host Names Not Resolving NS Lookup Works

Apr 21, 2011

I was thrown into trying to fix a friends pc being told that the internet wasn't working.What I've found through some messing around is that I am able to pull up websites with the ip address but trying to use the domain name give a "Host Not Found". Similar error when trying to do a ping. However doing an nslookup will pull the ip's for a domain. I've done the dns flush, the netsh commands that are floating around to no avail.

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Cisco Wireless :: 5500 - Default Gateway ARP Lookup Failed

Aug 31, 2012

On a 5500 series WLC I see I have an issue where peap clients get randomly disconnected with these errors
MAX_EAPOL_KEY_RETRANS: 1x_ptsm.c:444 Max EAPOL-key M1 retransmissions exceeded for client 24:77:03:35:79:34
AAA-6-ARP_LOOKUP_FAIL: radius_db.c:3232 Default gateway arp lookup failed.
aaaQueueReader: Aug 31 19:12:14.938: %AAA-4-RADIUSMSG_SEND_FAILED: radius_db.c:3567 Unable to send RADIUS message to

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Error Message In Google Chrome - DNS Lookup Failed

Jun 20, 2011

I have just gone through hours of tech support with my ISP and still cannot seem to get online. Problem is the same as recent posts by jerguy1928, with message "DNS lookup failed...." coming up in Google Chrome. Both IE and FF just say cannot connect.Running Windows 7 on laptop. I have tried alt DNS settings (Google and others), all the CMD suggestions, disabling firewalls etc, etc! Other computer in house connects just fine.Ping works fine. Really, there appears to be no reason to not be able to connect - since I am actually connected!

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