Cisco VPN :: 1921 Loop Back Interface / Static IP Address For Client

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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Cisco Switching/Routing :: C3550 - Configure Loop Back Interface On Gigabit Fiber Port

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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Jan 16, 2011

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Jan 8, 2013

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Aug 12, 2011

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Apr 21, 2013

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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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Access Device On Loop Back Subnet

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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Cisco VPN :: GRE Termination At 7600 Using Loop Back As Source

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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Cisco VPN :: 1800 GETVPN Crypto Map On Loop Back

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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Cisco WAN :: 892 / Static Ip Address Assigned To The Interface?

Feb 7, 2012

configure my cisco 892 router want a static ip address assigned to the interface because and I have no more internet on the router because am working on my network academy for CCENT?

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Cisco VPN :: Configure Static IP Address In Remote Client ASA 5500?

Aug 13, 2011

i am trying to configure static ip on remote client user side , i am using the following doc as an example but i am not getting the ip which i am mentiong in the user .[url]...

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Cisco Switches :: How To Use SG-300 Combo Ports For Loop Back Testing

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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Cisco Firewall :: 1811 NAT Port Range From Loop Back

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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Nov 22, 2012

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Jul 4, 2012

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Aug 22, 2011

I have an 8.3(2) ASA with a single outside IP.  Dynamic PAT translates inside addresses to the outside interface address.  I would like to use static NAT with port translation to access an inside syslog server.  I got an error when I tried using the outside interface address.  Can I use both dynamic PAT and Port Translation with the same outside address?This is what I would like to use but I receive an error saying there is an overlap using the outside interface address.(192.168.1.0 is my inside network.  10.10.1.10 is the outside interface IP.)
 
object network inside-net
  subnet 192.168.1.0 255.255.255.0
  nat (inside, outside) dynamic interface
 object network SYSLOG_SERVER
  host 192.168.1.50
  nat (inside,outside) static 10.10.1.10 service tcp ssh ssh

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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.)
 
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Cisco Switching/Routing :: WS-6748-SFP Diagnostic Test Loop Back Failed

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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Cisco Switches :: SG300 / Assign Static Ip Address On Vlan 1 Interface?

Dec 13, 2011

I am trying to assign static ip address on vlan 1 interface , the model no of switch is SG300 & the firmware version is 1.1.2.0 .But whenever I type the IP address & press enter , a  question is popped up asking for confirmation (switch0d851f(config-if)#ip address 1.1.1.1 255.0.0.0.

Please ensure that the port through which the device is managed has the proper settings and is a member of the new management interface.Would you like to apply this new configuration? (Y/N)[N] N )

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Cisco Firewall :: ASA5580 One Inside Source Address Static Nat To Two Outside Interface

May 10, 2012

customer has a server which located in inside interace.    and an outside interface connected to ISPA.    cu config a static nat map inside server address to ISPA address, one day customer install a new outside interface to ISPB, cu config new static nat ,map same server inside server address to ISPB address. the server will allways be vistited from outside interface and reply, custome want traffic coming from ISPA will return to ISPA, traffic coming from ISPB will return to ISPB. but i found it is difficult implement this on ASA5580. i want use route-map on static nat, but it will not satisfy customer's request.

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Cisco Firewall :: ASA5580 / One Inside Source Address Static Nat To Two Outside Interface?

Jul 13, 2011

i have a problem  customer has a server which located in inside interace.  and an outside interface connected to ISPA.  cu config a static nat map inside server address to ISPA address one day customer install a new outside interface to ISPB, cu config new static nat ,map same server inside server address to ISPB address.    the server will allways be vistited from outside interface and reply, custome want traffic coming from ISPA will return to ISPA, traffic coming from ISPB will return to ISPB. but i found it is difficult implement this on ASA5580.  i want use route-map on static nat, but it will not satisfy customer's request.

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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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Cisco Switching/Routing :: 2691 / 6500 - Unable To Ping IP Of IBGP Nei Loop Back

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]..... 
 
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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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Cisco WAN :: 1921 Dual Links Failover And Fail Back

Sep 19, 2012

I have a 1921 router with two wan interface configured, one is primary and the other is standby or backup in case the primary goes down, I was able to configure links to failover from primary to backup once there primary is down, but how do I configure to make sure when primary is up it failbak to to it. [code]

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Cisco WAN :: 1921 Provide IPSEC Tunnel Back To Central Office

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]

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Jul 17, 2012

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Cisco WAN :: 1921 With Static IP Won't Access Internet

Feb 24, 2012

I have the same 1921 router that I am trying to install at a facility with a Static IP address and Static DNS information to get on the internet and I cannot get the 1921 to access the internet!
 
Here is my config:
  
Building configuration... 
Current configuration : 4072 bytes
!
! Last configuration change at 09:51:57 Chicago Sun Feb 26 2012 by fbcpekin
! NVRAM config last updated at 09:51:58 Chicago Sun Feb 26 2012 by fbcpekin

[Code]....

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Cisco WAN :: 1921 - Static NAT Hangs Every Few Days

Apr 10, 2011

I am running a 1921 with 15.0(1)M4  on it.  The router has a /29 public block assigned to it so I have a public IP for my router's GW, a public IP for the WAN interface on the router, a public IP for PAT and the three remaining public IPs I use them as static NATs for internal hosts.
 
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I am fairly certain that this is not a config problem so I have shuffled around the public-to-private NAT entries.  Basically whatever public IP I assign to this host1 will at some point hang.  The host2, host3 and PAT always work and never hang no matter what public IP I issue to them.
 
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Oct 26, 2012

we are bringing up new ckt and nexus 7000's interface isn't coming up once telco gave a loop. and wee following msg when I do "sh int eth1/1".
 
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Why Don't Get Back An ACK Segment From Client

Jun 15, 2012

I am currently working on a project which purpose is to establish a TCP connection between a PC and a microcontroler.I configured (in C language) the µC as the server, and the PC as the client (in C#, using the TCPClient class).While running the codes, I capture the frames on the network with Wireshark.The client's ISN is chosen randomly by the TCPClient.Connect method.Since there will be only one TCP connection at a time, the server's ISN is always 0.The server's port is 0xC0C0 (49344) and the client's port is also chosen randomly by the TCPClient.Connect method.find the screenshot of the Wireshark's capture attached.In compliance with RFC793, the three-way-handshake should conclude with an ACK segment from the client.In my exemple, the client tries to connect three times, and then drops : the client sends no ACK segment.The µC's SYN-ACK reply may be bad configured .What kind of information did I miss ? Are there special data the client is expecting ? Why don't I get back an ACK segment from the client?

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Nov 9, 2012

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Apr 20, 2011

We are using a CISCO1921-SEC (ISR) with IOS 15.1 and we configured a "crypto isakmp client configuration group". We can connect with the "Cisco System VPN Client Version 5.0.07.0410" via IPSec/UDP.

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2. We searched for changing from upd connection to tcp connection via special port. Is it possible with IOS 15.1 on the CISCO1921-SEC ? Is there something possible like "iskamp ipsec-over-tcp port 10000" ?

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