Cisco WAN :: 2821 - Pinging Loopback Address

Sep 11, 2012

I have a cisco 2821 and have configured a llopback address which I want to use for management, however, I am unable to ping it from a device attached to GigabitEthernet0/0 

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Cisco Switching/Routing :: Ip Address Is Pinging But Not Available In ARP From Core 6500

Apr 30, 2012

I have an Issue.In my networks, 1 single user is facing Network Slowness issue. i needs to check to which port user is coneected in switch to CHeck whether that port has any errors.But problem is, i am providing support from remote location.And my concern LAN segment is Very big,I have only user Ip address details,when i ping the Ip address from Core switch it is pinging. but when i give show ip arp & give Ip address then its not learning and listing out the Mac address to trace down to the specific port.

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D-Link DIR-825 :: Pinging Local Computers On Network Brings Back A Foreign Ip Address

May 23, 2012

when I ping another workstation on my local network I should get back it's local IP but instead I am getting an ip address that resolves to somewhere in Germany!  In fact if I ping any bogus name, I mean anything, it returns this same address 62.116.181.25.  If I shut down my cable modem then everything resolves correctly.  And yes I have DNS relay enabled because it seems to be the only way to get the workstations to resolve external sites correctly. 

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Cisco WAN :: 2821 / Using Secondary IP Address For NAT?

Mar 16, 2012

On a cisco 2821 running 15.1(3)T1 From this cisco DOC, common use of secondary IP addresses on an interface are
 
•There might not be enough host addresses for a particular network segment. For example, suppose your subnetting allows up to 254 hosts per logical subnet, but on one physical subnet you must have 300 host addresses. Using secondary IP addresses on the routers or access servers allows you to have two logical subnets using one physical subnet.

•Many older networks were built using Level 2 bridges, and were not subnetted. The judicious use of secondary addresses can aid in the transition to a subnetted, router-based network. Routers on an older, bridged segment can easily be made aware that many subnets are on that segment.

•Two subnets of a single network might otherwise be separated by another network. You can create a single network from subnets that are physically separated by another network by using a secondary address. In these instances, the first network is extended, or layered on top of the second network. Note that a subnet cannot appear on more than one active interface of the router at a time.
 
On the WAN interface I've added two Secondary Public IP's (from the same subnet) to use for NAT to internal hosts.  Is this a common scenario or is there a more typical way to acheive this. This assumes, I do not want to put a Public IP on an interface on the internal server.
 
interface GigabitEthernet0/1
description WAN$ETH-WAN$
ip address x.x.x.1 255.255.255.240
ip address x.x.x.2 255.255.255.240 secondary
ip address x.x.x.3 255.255.255.240 secondary

[code]....

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Cisco WAN :: IP SLA544 Using With Loopback

Feb 17, 2011

I am facing issue with using IP SLA544, I am given a project in office and need to implement policy based routing,for some reasons i want to use loopback for it.I have 2 routers A and B, I just want if traffic from 216.0 network comes on A set next hop to routers B looback interface. Can i do it? its working fine with physical interfaces but not with loop back. This loop back is reachable and from router A if i telnet the loopback IP of B it actually gets me to Router B as well.

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Cisco :: What Is The Use Of Loopback Adapter In Windows Pc

Feb 15, 2013

How can we manage ASA in GNS3 through ASDM? And How to install image for IDS in GNS3?

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Cisco :: Force GRE Traffic To/from A Loopback?

Oct 29, 2012

I have a setup with a few sites that have layer three switches behind firewalls. I've been successful in setting up GRE tunnels between all the layer three switches, the GRE traverses IPsec which goes between the firewalls at each site. That way, the GRE is encrypted over the Internet and I don't have to deal with protocol forwarding and stuff. The GRE tunnels are terminated at the loopback addresses of each layer three switch, this works well for the most part, except that I need to put static routes for each loopback address in each switch to point via the firewalls, because when OSPF comes up over the GRE tunnels it starts advertising the loopbacks, and as such the switches think they can get to them over the GRE (which is built from the loopbacks to begin with), as you can see, sort of a catch 22. The static route method works fine, but it makes it so that I can't access the loopback address for monitoring/management purposes from any other sites on the basis that the local core tries to send it directly to the firewall rather than over the GRE tunnel. Is there any way to force only the GRE traffic out via the firewall while letting any other loopback-destined traffic go over the GRE? I'm thinking this could be done with a properly-matching route-map, but I'm not sure where I would apply it, could I apply it directly to the loopback or would the GRE traffic skip that on the way out?

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Cisco VPN :: Flow Is A Loopback ASA 5505

Feb 24, 2011

I have 2 ASA 5505, with a site-2-site vpn, I need to reach a server on network A on port 7887 from Network B.The 2 boxes are both on a public net and has a private net inside.When initiating a telnet session from a Host on network B, to a ip 172.210.210.56 /24 (which is defined as my remote network in the connection profile)I can see the trafic arriving on the ASA on network A, but the trafic gets rejected with the following.

Built local-host outside:VPN-TEST_172.210.210.5602:     VPN-TEST_172.210.210.56    7887    Teardown TCP connection 398765 for outside:VPN-TEST_x.x.x.x/16698 to outside:VPN-TEST_172.210.210.56/7887 duration 0:00:00 bytes 0 Flow is a loopback03:     Teardown local-host outside:VPN-TEST_172.210.210.56 duration 0:00:00.I'm a newbee with the ASA 5505, and connot figure out why this is a loopback ?

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Cisco WAN :: How To Configure Loopback On 1941

Jan 28, 2013

I've got some 1941 ciscos set on every branch.We have native L2 between this offices and I want to use external ip addresses on gig 0� interfaces anfdf local ip addresses on lo 0 interfaces, and use lo 0 for vpn connections.
 
I do:
 
int gig 0/0
ip add 192.168.181.14 255.255.255.0
ip nat outside
  
I can ping it from local network behind giga 0/1 but i can't ping it fro outside, how can i do this?

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Can't Ping Loopback Or Local Ip

Jan 4, 2011

I have a cisco router 2811 connected on other two routers but can't ping any of them from any of them too (frame-relay encap correct) DLCI mapping ok all ip configured only router 2 's line protocol is up the rest is down on others and seems LMI sent are not receive and do know how correct that

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Cisco Switching/Routing :: How To Set Up NAT Loopback On EPC3925

Dec 10, 2012

I would like to be able to use NAT loopback on a Cisco EPC3925 so that I can refer from my iPad to the webserver that is located on my iMac on the same LAN by using the external site name. Is that possible and if so, how can I configure the router?

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Cisco WAN :: Loopback Testing On 2610 Router

Jun 22, 2011

I am working at a client site today.  The client has a large Frame Relay Hub Spoke network.  The Hub is at the HQ location, and then there are about 15 spoke sites in remote offices.
 
We are having an issue with the frame between the HQ and one of the spokes.  We are currently working with our dear friends at AT&T to troubleshoot the issue.  AT&T yesterday was trying to run a local loop test to the router at the remote (spoke) end.  We were working iwth them in trying to put the remote router (which we manage) into a loopback mode.  We were trying to use controller commands
 
COOP-Rappahanock#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
COOP-Rappahanock(config)#controller ?
% Unrecognized command
COOP-Rappahanock(config)#controller
 
That we seem to run out of options...
 
How can we put the subinterface that is the other end fo the frame into loopback mode so that a local loop test can be done between us and AT&T (provider)?

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Enabling NAT Loopback On HG556a Router?

Jun 16, 2013

This is one of the standard issue vodafone routers. So i set up web-server on my laptop, and it is accessible to the internet now.

However I need to be able to access it from my machine using the public address. But I just cannot find where to enable nat loopback. I looked for options in both regular and advanced user logins (web interfaces). So I suppose the last option is telneting into it, and using commands to do it.. but I don't know how to access it (cant find the credentials). URL

In above link it says that i can find this info in configuration file, but how to access it?

And then what commands should I use to enable the NAT loopback?

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Cisco WAN :: ASR1002 / Loopback Interface Will Be Accessible From Internet

Apr 16, 2013

I have a router asr1002 and I need that my loopback interface will be accessible from internet ISP adderss space I have

46.xx.x.64 255.255.255.192 
interface TenGigabitEthernet0/2/0.301
description -=ISP=-
encapsulation dot1Q 301
ip address 46.xx.x.66 255.255.255.248

[code]...
 
packets transmitted 9received 0packet loss 100 %time 8063 ms

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Cisco WAN :: C7613 / One Loopback As Source To Multiple GRE Tunnel?

May 25, 2013

I wonder if there is no any issue when we are using one loopback interface as source address in case multiple GRE tunnel.However, the destination IP address different per each tunnel, only having same source loopback.
 
for example),
interface loo0
ip address a.a.a.a 255.255.255.0
!
 interface tunnel 10

[code].....
 
I saw warning message when I apply 2nd GRE tunnel on C7613, SRD6 IOS. we have a plan to enagle one more GRE tunnel in same.I need to decide to use adding one more loopback IP or just use this with ignoring warning message in terms of configuration easily.

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Linksys Wireless Router :: Set Up Loopback On A EA3500

Feb 25, 2013

In my home network, I have a Synology. It has 10.0.123.123 as local IP address on my local network and it can be accessed by internet with the dynamic domain name.So when I'm home, I have to use 10.0.123.123 to access it, and when I'm away, I have to use trucmuche.diskstation.me.Would it be possible to configure the EA3500 to redirect the domain name "trucmuche.diskstation.me" to 10.0.123.123 when I use the domain name inside my home ?A friend told me that I had to configure "loopback" but I don't know how..

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Disable IPv6 Loopback On Windows 7 64Bit?

Feb 24, 2013

I have a Windows 7 64 Bit machine, and I cannot find a way to disable the IPv6 Loopback. I looked at the article at How to disable IP version 6 or its specific components in Windows and shows how to set HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesTcpip6ParametersDisabledComponents to various values – but none of these seems to disable IPv6 Loopback. I attempted setting this value to 0xffffffff and 0x20 – restarting my computer after each change, and I still do not get this disabled.

I am using another software called Webdriver or Selenium that gives errors when debugging if IPv6 Loopback is not disabled. It seems to attempt to connect to [::1]:7055 and fails. Is there a way to force it to connect to 127.0.0.1.

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Cisco WAN :: Telnet To Other Devices From Nexus 7000 Loopback 1 Interface

Mar 29, 2011

how do I telnet to remote devices from nexus 7000 with source interface as loopback 1?

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Cisco VPN :: Can't Bring The VPN Up By Pinging From ASA 7.2

Jan 5, 2012

I've attached my ASA's config. I can't bring the VPN up by pinging from the ASA but the VPN will come up when someone pings from behind the ISA server. So the problem seems to be routing/NAT on my ASA because my pings aren't being directed out the tunnel. The VPN in question has 64.106.x.x as the peer and AES 256/SHA for phase 1 and 2.

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Linksys Wireless Router :: EA6500 Loopback NAT Not Work

Nov 14, 2012

I purchase new router EA6500 for fiber optic network 100/200 (my old WRT56GL is too slow for this speed). Now i have big problem with NAT Loop back - didn't work. How can I corrected this error. All other services work OK. I need this function for my mail server and web server on my firm) - now I can't connect  from local IP to my mail server and read messages. Firmvare version is 1.1.27.144730.

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My Pc Not Pinging Certain Switches

Jun 27, 2011

I found that Alternate LAN card will support.After replacing another LAN card i can ping all switches.But i want to know why my pc not pinging certain switches connected in network.Even i cleared the port security

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Cisco :: IP Is Not Pinging By Other System In The Network

Aug 29, 2012

my system ip not able to ping by other system in my company network but my system is in the network and able to ping other system in the network my system IP have static IP and IP is pinging on by server

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Cisco WAN :: 3945 Channelized E1 Not Pinging Self

Mar 3, 2013

We have recentrly replaced a 1700 router with Cisco 3945 router (Core Router) and the Channalised E1 interface is configured as given below: [code]
The issue happens intermittenly and makes network not reahable.Status of the links are UP/UP - No traffic forwarded through the link (Ser 0/0/0:1 and Ser 0/0/0:2) and at the same time not able to ping the local IP Address as well - 10.5.10.1/10.7.10.1.No issue on the Ser 0/0/0:0 link - Working fine.If you replace the new router with the old one all are working fine.

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Cisco Firewall :: Pinging Across 2 ASA 5510s

Dec 16, 2012

Here's my basic setup:
 
Computer A:
IP- 192.168.0.3
Mask- 255.255.252.0
Gateway- 192.168.0.2

[Code]....

Computer A can ping Firewall 1 and Firewall 2, but not Computer B. Computer B can ping Firewall 1 and Firewall 2, but not Computer A. Firewall 1 can ping Firewall 2, Computer A, and Computer B. Firewall 2 can ping Firewall 1, Computer A, and Computer B.
 
Why can't the computers ping each other, but their default gateways can? I've specifically allowed ICMP any any on all the affected interfaces.

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TP-Link ADSL2+ Wireless :: TD-VG3631 Does Modem Support NAT Loopback

Apr 3, 2013

Region : UnitedStates
Model : TD-VG3631
Hardware Version : V1
Firmware Version : TD-VG3631_V1_130108

Does this modem support NAT Loopback? I can't get it to work.If so, why not, can we have a firmware that supports NAT Loop back?

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Connected But Computer Does Not See Other Through Pinging?

Aug 19, 2011

One computer does not see the other through pinging...but somehow we are connected...strange i know. My confusion ( being network illerate ) is with the names and etc. and some terminologies ie ..client? host? I have found in the past when someone triesthey use words or areas that do not coincide with my system...which is laptop with win 7 prem and desktop XP sp3

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Pinging Between NIC Cards On Same Machine?

Feb 23, 2011

I have 2 NIC cards on the same machine running Redhat 9.I need to setup the machine in such a way that both cards are in the same subnet but card on port eth1 can be reached through card on port eth0.I tried modifying the iptables (with the limited knowledge that I have on it,used google) and even tried turning it off.I also tried setting files /proc/sys/net/ipv4/ip_forward and /proc/sys/net/ipv4/conf/all/proxy_arp to 1 but was unable to ping from IP address on port 0 to IP address on port 1 and vice-versa

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Cisco Switching/Routing :: CBS3020-HPQ / Port Fails POST In Loopback Test?

Jun 5, 2012

I have a Cisco CBS3020-HPQ chassis switch running IOS 12.2.(25r)SEF3.  One of the ports is in "disabled" state but when I try to unshut it, it doesn't work, the switch logs shows the following event:
 
%PLATFORM_ENV-3-LOOPBACK_PORT_POST_ERR: Gi0/1 can't be brought up because it failed POST in Loopback test
 
how do I resolve this, the port is unusable since I can not get it out "disabled" state.

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Cisco :: ARP Cache Contents When Pinging An Outside Host?

Apr 22, 2013

If we have the following setup:Host A (IP :192.168.1.1, Prefix/length : 24, GW : 192.168.1.254) connected to the Router A on int Fa0/1 (IP : 192.168.1.254), Router A is connected to Router B, Host B (IP :192.168.2.1, Prefix/length : 24, GW : 192.168.2.254),connected to Router B on int Fa0/1 (IP : 192.168.2.254).Using the mentioned setup, after Host A pings Host B successfully, which entry will be in the ARP cache of Host A to support the transmission ?.

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Cisco Switching/Routing :: Getting RTO While Pinging 3750?

May 29, 2013

I am getting RTO while pinging my L3 switch 3750 that happened after restarting switch,i have restarted it because I am not able to browse internet through URL,i am able to do it trough ip address, so I restarted it not I am getting RTO.

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TP-Link ADSL2+ Wireless :: TD-W8968 Virtual Servers Does Not Have Loopback Function

Mar 10, 2013

When can we have an upgrade to include 'Lookback' function for Virtual Server ? I understand both Build-120802 and Build-120926 does not support this Loopback feature. Without the loopback feature, we won't be able to test out Dynamic DNS URL is working or otherwise on local PC.

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TP-Link Dual-Band Wireless :: TL-WDR3600 - NAT Loopback Confirmation Required?

Mar 7, 2013

Region : UnitedKingdom
Model : TL-WDR4300
Hardware Version : not clear
Firmware Version :
ISP : BT

I am thinking of buying a TL-WDR3600, but just need to know the answer to the question below.Can anyone confirm if the TL-WDR3600 supports NAT Loopback functionality?

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VPN Connection Dies When Not Constantly Pinging

Jul 2, 2011

I will be moving away from my home computer but will still want access to it so I am trying to set up a VPN between it (home computer is windows 7) and my fedora 15 machine. They are currently on the same 192.168.1.0/24 network so I'm wondering if that may be the cause for my troubles.

Here's my setup:

Fedora 15 (192.168.1.3) is running the PPTP server with pptpd and gives 192.168.1.66 to any vpn client that connects to it./etc/pptpd.conf only has "localip 192.168.1.3" and "remoteip 192.168.1.66" options in it /etc/ppp/options.pptpd has "refuse-pap, refuse-chap, refuse-mschap, require-mschap-v2, require-mppe-128, proxyarp, lock, nobsdcomp, novj, novjccomp, nologfd, debug, dump" options Windows 7 (192.168.1.6, 192.168.1.66) is the client and I have it set to use connect to the public IP address of my router, PPTP, require encryption, only allow mschap-v2, don't use gateway in ipv4 properties.Both machines are connected to the same Belkin router (192.168.1.254) and I can ping locally to and from each computer no problem. The problem is my VPN connection is very inconsistent. I will open a ftp connection to 192.168.1.66 from 192.168.1.3, login, start uploading a file, get about 10MB uploaded, and then the VPN connection will die and the upload will fail. But, when I have "ping 192.168.1.66" running while uploading, the connection stays alive.

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