Cisco VPN :: 886 DMVPN Tunnel Sourced Via Loop Back Error
Nov 22, 2012
I am having a hard time trying to configure DMVPN with the tunnel being sourced via a loopback interface. All routers are Cisco 886 routers which don't have L3 ports.That is why I used SVI interfaces, and have configured the L2 ports (Fa0, Fa1, etc.) with the command switchport access vlan.The problem is that I am receiving Invalid SPI error's only on the Hub router and I have no clue what could be the problem, because they use exactly the same parameters for IPsec. [code]
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Aug 12, 2011
What is the purpose of loop back testing.
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Apr 21, 2013
I don't do a lot of networking however during a cisco lesson the other day my lecturer briefly touched upon loop-back tests, would it be okay for somebody to very imply sum up exactly what loop-back tests do in a couple of lines and how they are carried out? (not in detail, so literally for example - a wire is put in from one end of the network to the other etc.) I don't really understand all the different wiring types etc.
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Sep 30, 2011
I recently replaced a client's router with a Cisco RV 120W. The client employs a web-based application on an internal server that manages their business. Workers in the field use a handheld device power by WIndows Mobile to access a mobile version of the the web-based app. Data contained on the mobile app syncronizes with the server when workers choose a sync menu. Some workers perform this sync in the field, others wait till they return to the office and use the wireless provided by the router. Prior to changing the router, the synching worked fine either inside or outside the company network. The mobile app accesses the internal server via the router's public IP address. The router forwards the http requests to the internal server. But now the synching does not work internally. I assume it's because the Cisco RV 120 W does not support NAT Loopback, or I simply haven't figured out how to enable it. Does anyone know how to enable NAT Loopback on the RV 120 W so I can access the web-based app by through the router's external IP while on the private side of the LAN??
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Jul 12, 2011
I am working with a device that does not have a physical reset button on it, and have mistakenly typed in 127.x.x.127 for it's IP. I was trying to use 172, but mistyped and didn't catch it until after I had rebooted the unit. Is there anyway that I might be able to gain access to the device. My PC is running Windows 7, but I am familiar with linux as well. I have attempted to change the loopback adapter IP to 128 on a ubuntu live disc and set my ethernet port to the subnet the device is on with no avail. (I am also using vlans on the device, but believe I have them set up correctly)the device is set to IP: 127.x.x.127 netmask 255.255.255.128. [code] I know that the last octet of 127 is the broadcast IP for the range, but have been able to address similar blunders before by forcing myself to a /24 subnet to correct that.
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May 7, 2012
I am terminating GRE vrf-lite on my 7600 and using loopback as source for each client.I found one problem where 7600 seems to be not forwarding traffic until I delete create the tunnel interface.Worked fine for a week. Then stopped again. I had to delete,create again tunnel interface.
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Jan 12, 2013
We have 6 WAN routers connected through ISP MPLS cloud , we need to implement GET VPN between these WAN routers.We have 2 Key servers (1800 routers) , and the WAN routers will act as Group Members (6 GMs)
The attached configuration files are for working configuration for typical GETVPN (crypto map applied on WAN interface)
In Key server configuration , the crypto isakmp command is using the WAN interface IP address of each WAN router (172.16.x.x) , and since that the KS routers are connected to local backbone (VSS) , they should be able to reach 172.16.X.X , and therefore the subnet 172.16.X.X is advertised to the local network (check GM configuration file under eigrp - redist connected )
This is what our customer want to avoid ! they do not want 172.16.X.X to be advertised to the local network .I know It is possible in GETVPN configuration to configure ,the crypto isakmp command to use loopback address's of the WAN routers instead of the WAN IP , but in this case the crypto map must be applied to the loopback address , and this requires all traffic to be encrypted and decrypted to go through the loopback interfaces on all WAN routers .
i was wondering what is the best solution for this case , I though to use the below config on the GM's
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Sep 5, 2011
I've got an SG300-10P switch and am trying to use it to create a testing environment for a Fiber Test set. What I would like to do is get two hosts, A & B, plugged into ports 1 and 3 on the switch, to talk to each other, but forcing the traffic to be routed through the two Combo ports 9 & 10. Please see the attached diagram.I've attempted to configure two VLAN's, 10 and 20. Vlan 10 is used for traffic between Ports 1 and 9, Vlan 20 is used for traffic between Ports 3 and 10.I don't really care whether the traffic is tagged or untagged as it passes between ports 9 and 10.
I've tried various combinations of tagged/untagged ports, PVID's, etc. As a first test I've bypassed the Fiber Test set and simply created a direct connection between ports 9 and 10. I am unable to get the traffic from Host A to Host B to get routed through ports 9 and 10 (I ping each host from the other and get no response).
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Feb 19, 2013
I need to NAT a port range spanning from TCP and UDP 50,000 to 59,999 from inside global address 58.96.x.x on loopback2 to an inside local address of 192.168.5.5.Currently all the existing NAT translations are 1-to-1 that map inside global addresses on a wide span of Loopbacks and a Dialer Interface to inside local addresses on few subnets which are fine.I'm using an 1811 with an ADVIPSERVICESK9-M image, version 12.4(6)TS
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Jul 4, 2012
How to create loopback cable for gig copper port (cisco 6513).I
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Nov 17, 2012
I have a couple a questions answers on which i cant google for a period. BTW maybe i simly use wrong aproach to choose keywords.
1) Is it possible to assign same ip address to the same client each time it authenticated, preferably without using DHCP? Im definely sure that it possible but cant find corresponded configuration examples (my device is Cisco 1921 with IOS 15.0.1).
2) Is it possible to assign dynamic crypto map to loopback interface (the purpose to make EASY VPN Server accessible through two interfaces - maybe you recommend other approach instead?) - as i move workingcrypto map from phy int to loopback - i cant connect with reason "Phace1 SA policy proposal not accepted"
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Jun 7, 2012
I have a bunch of 3750x switches that each have a 10 gig routed link back to a central 4507 (loopback = 172.30.255.255).We carved up a /24 (of course, the /24 doesn't really exist except in our address tracking spreadsheet) into a bunch of /30's for routed WAN links and /32's for loopback addresses.We started on the low end for /30 subnets (ie 172.30.255.0/30, 172.30.255.4/30, etc.).We started at the high end for the /32 loopbacks (ie 172.30.255.255/32, 172.30.255.254/32, etc.)
Well, when I try pinging 172.30.255.255 from the access layer 3750x switches, the 3750x seems to be treating it as a broadcast ping where it lists each member that responds instead of the regular !!!!! response (this makes think something is odd with the 3750x). Of course, only one member responds (the core). But even the core seems to respond with the other end of the /30 instead of the actual /32 loopback (which makes me think something is odd in the core). I could have sworn that I've setup similar topologies without problems (ie, using 10.0.0.0/32, 10.255.255.255/32, etc as loopbacks) and as long as the mask is a /32, it should work.Also, I can ping/ssh to that loopback if my laptop is on a directly connected subnet. But I can't do it from any of the 3750x switches (which are also directly connected).I've double checked for overlapping subnets, but nope. I don't see any. Routing looks fine. The actual /32 is being propagated everywhere properly.
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Aug 18, 2012
The following error was seen on the switch and the Diagnostic Test Loop back failed following a new WS-6748-SFP module installation.Fabric in slot 5 detected excessive flow-control on channel 3 (Module 4, fabric connection 1)
Tried Hard reset of the module and still the error persist.
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Nov 4, 2011
Why is loop-back only working on ports forwarded in the Virtual Server section and not Port Forwarding or even DMZ? I have seen a post about loop-back on the DIR-655 from a while ago that had said to disable SPI and change NAT Endpoint to independent, I have done this and loop-back still doesn't work.
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Apr 6, 2012
Here is my Lab Setup: 2691 is BGP nei to R4 router and they are not directly connected. 2691 and R4 are in same AS 6500. 2691 Config---router ospf 1 network 3.3.3.3 0.0.0.0 area 0 . Its advertising its loop back IP to OSPF domain.
router bgp 6500
no synchronization
bgp log-neighbor-changes
neighbor 6.6.6.6 remote-as 6500
neighbor 6.6.6.6 update-source Loopback3
[code]...
R4 Router
router ospf 11
log-adjacency-changes
network 6.6.6.6 0.0.0.0 area 0
[ code].....
We can see that 2691 and R4 are BGP neis and 2691 has 200.1.x.x routes in its route table. My question is why from 2691 router i am unable to ping any route learned by BGP from R4?
2691Router# ping 50.1.1.0 Type escape sequence to abort.Sending 5, 100-byte ICMP Echos to 50.1.1.0, timeout is 2 seconds:.....Success rate is 0 percent (0/5)2691Router#ping 200.1.2.0 [ code]...
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Sep 14, 2012
I am trying to configure a loop back interface like so: [URL], on the following device:
C3550 Software (C3550-IPSERVICESK9-M), Version 12.2(50)SE, RELEASE SOFTWARE (fc1on port gig0/1 which is using a 1000Base-SX adapter. This is for troubleshooting purposes and it does not appear to be a feasible option. Is there another way to accomplish in the IOS?
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Apr 25, 2013
i have a general Question regarding buildings SA´s between two peers.Can I establish more than one SA between two Peers with the same IP Address?Actually I have 3 DMVPN´s running in parallel in different VRF´s using the same SA.They have all the same IPSEC encryption AES256.Now I need to reduce the encryption to 3DES in one of the three DMVPN´s.Is that possible or do I need a differnet IP Address so that the SA Pair is unique?Thats how I stared, with a Phase 2 failure that it is not acceptable.
crypto keyring preshared
pre-shared-key address x.x.x.x key ....ncvnbxcnbLsaYiKtxc4ex4U99Tn...
pre-shared-key address x.x.x.x key ....qerqwerJLsaYiKtxc4ex4U99Tn...
pre-shared-key address 0.0.0.0 0.0.0.0 key ....JLsaYiKtxewrc4ex4U99Tn...
[code]....
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Jul 8, 2011
We have a 6 spoke DMVPN setup. Five of the six spokes work fine. On the 6th spoke, a 2911, we have created a Tunnel0. Other spokes and the hubs can ping it's ip, but it can't ping itself. When we do a show interface it shows the Tunnel 0 is up, but the protocol is down. What does that mean?
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May 12, 2011
Scenario:
Central Router (WAN: 1.1.1.1) <--> Internet <--> (WAN: Dynamic IP) Branch RouterTunnel 172.31.254.1/26 Tunnel 172.31.254.9/26
Central router is a Cisco 1811 running IOS c181x-advipservicesk9-mz.151-4.M.bin.Branch router is a Cisco 1941 running IOS c1900-universalk9-mz.SPA.151-4.M.bin.
When I do a Ping test directly from the branch to central router over the Internet I have no packet loss:
branch#ping 1.1.1.1 source GigabitEthernet 0/0 repeat 1000Type escape sequence to abort.Sending 1000, 100-byte ICMP Echos to 1.1.1.1, timeout is 2 seconds:Packet sent with a source address of 192.168.0.100!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!(...)!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!Success rate is 100 percent (1000/1000), round-trip min/avg/max = 40/41/60 msbranch#
When doing a Ping test over the DMVPN tunnel (which is using the WAN IP as source) I see packetloss.
branch#ping 172.31.254.1 source Tunnel 3 repeat 1000Type escape sequence to abort.Sending 1000, 100-byte ICMP Echos to 172.31.254.1, timeout is 2 seconds:Packet sent with a source address of 172.31.254.9!!!!!!!!!!.!!!!!!!!!!.!.!!!!!!.!!!!!..!!!!!!..!!!!!!!!.!!.!!!!!.!!!!!!!!!!!!.!!!!!.!!!.!!!!!!!!!!!..!!!!.!.!.!!!!!.!!!!!!!!!.!..!!!.!.!!!!!.(...)!!!!!!.!!!.!!!!.!!!!.!.!!.!!!!!!!!!!!!!!!.!!.!!!!!!!!!.!!!.!!.!.!!!!!...!!!!!!!!!!..!!!!!!Success rate is 79 percent (795/1000), round-trip min/avg/max = 40/43/568 msbranch#
Central:
interface Tunnel0 description Testing (DMVPN) bandwidth 10000 ip address 172.31.254.1 255.255.255.192 no ip redirects ip mtu 1400 ip nhrp authentication testing ip nhrp map multicast dynamic ip nhrp network-id 1 ip nhrp holdtime 600 ip nhrp redirect ip tcp adjust-mss 1360 no ip split-horizon eigrp 1 tunnel source FastEthernet1 tunnel mode gre multipoint tunnel key 100003 tunnel bandwidth transmit 10000 tunnel bandwidth receive 10000 tunnel protection ipsec profile secure_profile shared
Branch:
interface Tunnel3 description Testing (DMVPN) bandwidth 2000 ip address 172.31.254.9 255.255.255.192 no ip redirects ip mtu 1400 ip nhrp authentication testing ip nhrp map multicast 1.1.1.1 ip nhrp map 172.31.254.1 1.1.1.1 ip nhrp network-id 1 ip nhrp holdtime 300 ip nhrp nhs 172.31.254.1 ip nhrp shortcut ip nhrp redirect ip tcp adjust-mss 1360 no ip split-horizon eigrp 1 delay 1000 tunnel source GigabitEthernet0/0 tunnel mode gre multipoint tunnel key 100003 tunnel bandwidth transmit 2000 tunnel bandwidth receive 2000 tunnel protection ipsec profile secure_profile shared
Crypto parameters on both central and branch routers:
crypto isakmp policy 1 authentication pre-share
crypto ipsec transform-set secure_transform-set esp-3des esp-sha-hmac mode transport
crypto ipsec profile secure_profile set transform-set secure_transform-set
I disabled CEF on both the central and branch routers and no success. The EIGRP neighborship appears to be stable.
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Apr 23, 2012
So in our DMVPN network, we have this Cisco 3845 hub router that is connected via a DS3 to the Internet, and our spoke sites usually have a broadband connection that typically have a maximum of 1Mbps upload capacity. We are getting ready to add a few more sites to our network that are connected to the Internet with 10Mbps upload speeds (and 50Mbps download). Spoke site routers are usually 800 series ISRs. We have seen spikes of 8-10Mbps on the hub router so far. So the question is that a site with 10Mbps upload speed transmit to the full capacity over a DMVPN tunnel or is it limited by other factors? What are those factors?
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May 15, 2013
We are facing network heavy and slow performance at one of our remote site, we are using Cisco2800 series router with same IOS on either of the sites.Our WAN network is running on BGP with EIGRP configured and tunnels were configured on either of the sites. As part of the testing I have removed the tunnel to see the performance was ok from Head office to remote branch and the WAN network is getting heavy and slow down when we put the tunnel back in hub and spoke.
quick info
Cisco 2800 Series router
IOS: (C2800NM-ADVIPSERVICESK9-M), Version 12.4(15)T1, RELEASE SOFTWARE
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Mar 21, 2013
I have a setup where a spoke (cisco 1841) is sending a multicast feed to a hub (cisco 2951) via a DMVPN tunnel on the Internet. The feed arrives on interface fa0/0 of the cisco 1841 and is forwarded to the tunnel interface. It is about 160,000 kbit/s and 18 pps. This always looks the same:
cisco2951-1-hub#sh run int tu10
!
interface Tunnel10
description DMVPN TUNNEL
[Code]...
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May 3, 2013
One of the customers has deployed Cisco 7609S in their infrastructure for Branch/RO connectivity. When we tried to configure per-tunnel QoS with DMVPN for MPLS connected sites, we came to know that Cat 6500 and Cisco 7600 series routers don't support this feature.
Now, we are looking for suitable replacement of Cisco 7609S. I found a document for configuring above feature on Cisco ASR 1000 series routers, but it has many restrictions always.
We are now looking for
(a) suitable platform in the league of Cisco 7609S which support above feature.
(b) suitable technology replacement of DMVPN with minimum restrictions.
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Jan 16, 2011
is it possible to assign a loopback address to a typical switch port on a 2950 switch? I want to be able to have some devices connected to a switch to test access lists and VLANs.
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Jun 7, 2013
when this error occurs
we can't see the cdp neighbor and the wireless crash.
we login onto the ap with console , we can see the error log : “Network interrupt loop detected” . last forever
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May 15, 2013
I'm trying to configure an LACP channel trunk between a CatOS C6000 and a Dell PowerConnect.
I use mode active in both sides and it works great.
But, when I connect a Catalyst 3750X to the Dell PowerConnect the channel between C6000 and PWC shutdown:
2013 May 16 09:08:20 CEST +02:00 %SPANTREE-2-CHNMISCFG: STP loop - channel 5/19-20 is disabled in vlan/instance 20
2013 May 16 09:08:20 CEST +02:00 %SPANTREE-2-CHNMISCFG2: BPDU source mac addresses: 00-04-6d-43-a4-e2, 70-ca-9b-27-46-99
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Apr 15, 2013
Cisco 2800, 12.4(23b) router has two VPN tunnels to other Cisco devices.
Authentication uses certificates from a PKI CA server. Under normal circumstances all works fine, both crypto sessions up.
After a power cycle (having first saved configs) however, the crypto sessions are stuck in DOWN-NEGOTIATING.
The certificate on the router still looks valid.
The only way to get the sessions back up is to renew the certificate, which seems strange as the existing one appeared to be still valid.
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May 5, 2011
Equipment Cisco1921, HWIC-1ADSL, 2 x GB Ethernet interfaces (Only one used for local LAN) Software IOS Version 15.1(1)T2..I have been asked to configure this router to provide an IPSEC tunnel back to our central office.We have been provided with an ADSL business class 7MB service from Telecom Italia, they have presented the circuit to our office with no terminating equipment (wires only). Telecom Italia have provided us with some IP addressing information as follows (I will not disclose the entire IP address) [code]
I can see that the packet count is increasing both inbound and outbound on the ATM interface. I have read many documents and tried many different way to try and get this resolved, I even logged a call with Cisco but no dice.
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Jun 21, 2012
I configured dmvpn at cisco router 2900. one hub router and 3 spokes. all of them are working normally but tomorrow i see one error at at one spoke router.
error:
Maximum Tx Bandwidth limit of 85000 Kbps reached for Crypto functionality with securityk9 technology package license
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Oct 10, 2012
I'm able to build my tunnel but unable to RDP nor ICMP back to the internal network.
VPN Client IP: 192.168.200.200
INTERNAL IP: 172.17.130.200
my configuration is below:
HOME-ASAFW02(config)# wr t: Saved:ASA Version 8.4(4)!hostname HOME-ASAFW02domain-name hsd1.nj.comcast.netenable password ViPq56cvd3SGvB08 encryptedpasswd 8bcozHCAwCqA5BmN encryptednames!interface Ethernet0/0description OUTSIDE-Connectionswitchport access vlan 2switchport protected!interface Ethernet0/1description INSIDE-Connectionswitchport protectedspeed 100duplex full!interface Ethernet0/2description WiFi-LinkSYSswitchport access vlan 3switchport protected!interface Ethernet0/3shutdown!interface Ethernet0/4shutdown!interface Ethernet0/5shutdown!interface Ethernet0/6shutdown!interface Ethernet0/7shutdown!interface Vlan1description INTERNAL-Networknameif insidesecurity-level 100ip address 172.17.130.129 255.255.255.128!interface Vlan2description OUTSIDE-Link-to-ISPnameif
[code]....
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Oct 11, 2012
I'm getting the following error in the log of a 2901:
%CERM-4-TUNNEL_LIMIT: Maximum tunnel limit of 225 reached for Crypto functionality with securityk9 technology package license.
I'm a bit confused by this since there is only 1 active SA at the time.Here is some more info:
2901#sh crypto eli
Hardware Encryption : ACTIVE
Number of hardware crypto engines = 1
CryptoEngine Onboard VPN details: state = Active
Capability : IPPCP, DES, 3DES, AES, IPv6, GDOI, FAILCLOSE, HA
IPSec-Session : 768 active, 2800 max, 0 failed
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Nov 25, 2012
I have a Cisco 8510msr that is connected back to back with a 7206vxr across a 155Meg connection.I receive lots of Output drops on the 7206vxr interface facing the atm switch. When I do the following command:-
kwdair9#sh atm int atm 1/0Interface ATM1/0:AAL enabled: AAL5 , Maximum VCs: 4096, Current VCCs: 27 Maximum Transmit Channels: 0Max. Datagram Size: 4528PLIM Type: SONET - 155000Kbps, TX clocking: LINECell-payload scrambling: ONsts-stream scrambling: ON797522 input, 881483 output, 203946630 IN fast, 223768062 OUT fast, 0 out dropVBR-NRT : 110288 Avail bw = 44712 <====
I only have 44megConfig. is ACTIVEkwdair9# I only get 44Meg of the available 155Meg.There is no QOS on the router and the only commands I can find that vaguely see that refer to QOS are on the ATM switch:-
atm address 47.0091.8100.0000.0007.0d87.b201.0007.0d87.b201.00atm router pnnino aesa embedded-number left-justifiednode 1 level 56 lowest redistribute atm-static?why this is acting like a DS3 link and not a 155Meg link?
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Dec 4, 2011
What cable I need to connect two 2951 back to back through a HWIC-4T1/E1 card ?
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