Cisco Infrastructure :: Configuring NAT On 1921 Router
Jan 31, 2012
We are having problems configuring NAT on our Cisco 1921 Router. Below is the running config. The problem we're having is for example our FTP server 192.168.1.16, cannot be accessed from its outside IP address, which is NATed on the router. The server is verified to be up and running and when we do a show debug ip nat, we see the router is translating outside users attempting to access the ftp server to it's correct internal IP address.
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Oct 3, 2012
What are the commands for Configuring Cisco 1921 Route's Gigabit Port G0/0 or G0/1 for Leased Line termination having Ethernet Hands Off
Modem Provided by ISP (BSNL ) is CTR-U
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Feb 6, 2013
I've been trying to set up my new Cisco 1921 Router to provide internet access to my local network but with no success. I've been reading guides and looking at videos and I have to be missing something becaouse I can't access internet (ping/tracert) from my local network.
The DHCP server works fine and the clients on my local network gets ip-adresses from the router but can't ping or tracert outside the local network.
[code]....
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Nov 13, 2012
I am using a Cisco 1921 with a Verizon 4G LTE card installed. The primary connection is a Cable Modem with the 4G LTE acting as the backup. I've setup a track on the static route to the primary ISP. I'm having multiple issues. Initially I used the Gig 0/0 int instead of a Loopback address for the IP SLA source. The IP SLA traffic would be sent to the cellular interface and cause an IP source violation and the interface would flap. Then I used the Loopback and I could not get the route to fail back when the connection came back up. Even with the Loopback as the source for IP SLA I'm still getting flapping and I think that is a NAT configuration issue. I've applied an access-group on the cellular interface to try to fix the ip source violation issues, but it doesn't appear to work. The IP-SLA-POLICY route map is an attempt to force the IP SLA traffic to the primary interface. [code]
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Jan 15, 2013
I have a trouble to implement dynamic QoS between two sites (Site A, and site B) across low speed WAN link (512k). On each site I have Cisco 1921 router. Most important app is Oracle. Because of slow speed WAN links, I want to avoid exact bandwith reservation for Oracle. I only reserve 5% bandwith for network control(icmp, ssh, telnet...) and want configure next Qos scenario:
1. If Oracle traffic exist on a network, it must have 70% of link speed guaranteed, all other apps (e.g mail, file share, ftp) use rest of the bandwith.
2. If there isn't Oracle traffic on a network, all other apps can use all available bandwith.
Issue descrtption:I used all Cisco guides, but when I implemented this on production it simply didn't work. There is no any significant improvement after implementing this (when I start network file sharing accross wan link, Oracle becomes etremly slow.).Here is configuration wich I trying to implement:
ACL-s and class-maps used to mark traffic:
access-list 119 remark ###QoS-MGMT###
access-list 119 permit tcp any any eq 22
access-list 119 permit tcp any any eq telnet
access-list 119 permit icmp any any
access-list 120 remark ###QoS-DB_ORA###
[code].....
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Mar 24, 2013
I have WS-3750G-12S-E with me and would like to configure BGP on the same. whether it is advisable to configure BGP on 3750G or not.
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Sep 13, 2012
I have two EHWIC VA -DSL cards in a Cisco 2901.
I want each to connect to a separate ISP, one ISP for VOIP, one for Internet. I want to then have a VLAN for VOIP, a VLAN for DATA
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Feb 28, 2006
Ihave a 3560 w/multicast support and I'm trying to configure a simple environment. I have 2 ports configured, one for the multicast server and the other for the client. Each are on their own subnet, so I have an ip route between the two. My run config on both ports is:
ip multicast-routing distributed
interface fastethernet 0/3 & 0/4
ip pim version 2
ip pim sparse-dense-mode
I'm using vlc server /client configured to use 224.0.0.1 on my isolated network. I can see the mulitcast traffic going into the port, and I the client is sending reports, but I think the 3560 is dropping the packets, since I don't see them coming in the client port. Need to configure a simple multicast environment using 2 ports on a Cisco 3560.
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Oct 5, 2012
We want to puchase new Cisco ISR 1921/K9 . i want to know does it support the following sample IP-SLA commands
ip sla 2icmp-echo 172.16.1.2timeout 500frequency 1ip sla schedule 2 life forever start-time now
track 10 rtr 1 reachability
delay down 1 up 1
!
track 20 rtr 2 reachability
delay down 1 up 1
ip route 0.0.0.0 0.0.0.0 192.168.1.2 track 10ip route 0.0.0.0 0.0.0.0 172.16.1.2 track 20
Im asking above question because we will need to enable ip-sla on the mentioned router. as i read on the cisco webside, it says Cisco-ISR-1921/K9-IP Base support only IP-SLA RESPONDER feature nothing else. If Cisco-921/K9 does not support the above commands , should i go for ordering Cisco-1921-SEC/K9 ?
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May 18, 2011
I have installed a Cisco 1921 router in our company and i have stumbled upon an issue with the DNS.
We have a internal DNS server and an internal WEB server. In the DNS server there are records pointing to sites on the WEB server, this is working just fine.
The thing is when i use a public DNS such as 8.8.8.8 (googles public DNS) i cannot resolv the external IP of those sites. I do not want to access the sites and i do not want to send any packets to the sites. All i want is to query the public DNS and resolv the public IP where the site is.
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May 3, 2013
I am really stuck with router requirement for one of our client. I need 891 SEC router. I think this comes with advanced IP services. What I have is 1921, with IP Base. can I upgrade 1921, so it will become alternative to 891 SEC.
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Feb 23, 2011
I'm attempting to set up a Cisco 1921 router running IOS15, and am having trouble with the NAT - it might be that what I am attempting is not possible. The only traffic going across the router is UDP, and the outside of the network canot be changed.
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Jun 4, 2012
I wish to use a 1921/k9 as a router on a stick. Inside interface interconnects up to 9 VLAN, and performs the routing. Does the 1921/k9 supports trunking and VLANs (I think it should support 16 VLAN, but I am not shure) or I should choose 1921-SEC-k9? Routing performance is the same both on 1921/k9 and 1921-SEC-k9? (I think I'll use static routes or RIP, it is not a large network)
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Feb 18, 2012
The router passes the Interface test for the WAN port in CCP but it still we cannot access the internet. Here is my configuration:
Building configuration...
Current configuration : 3663 bytes
!
! Last configuration change at 09:29:52 Chicago Mon Feb 20 2012 by fbcpekin
version 15.1
[Code].......
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Mar 17, 2013
I have a 1921 with 3 interfaces. One for the LAN and the other 2 are wan each with a public address. The 2 wan interfaces are used for redundancy. I would like to know how I can static nat the same port and inside address on both wan interfaces.So if the request comes in on one or the other it works. I know if I do a static nat to one of the wan interfaces and then add the same port and inside address to the other wan interface it replaces the previous configure.
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Aug 14, 2011
i have a cisco 1921 router and it has ge0/0 (LAN) and ge(0/1) WAN. ge 0/0 is well connected and i can ping it and the LED light is on but ge 0/1 has failed to come up.Ge0/1 is connected to an IDU and has a public IP address. The LED light also does not light on ge 0/1.Where could the problem be?
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Feb 9, 2012
how do I monitor temperature of my 1921 router? Which commands do I need to put on router and which MIBs to use. I am using PRTG network monitor as a monitoring system.
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Apr 26, 2012
I have a 1921 router with a V.2 T1 wic installed connected to a MPLS circuit. The circuit is down hard and the CD light is flashing. We reseated the WIC card and the circuit recovered for about 30 seconds, then went down and CD began flashing again on the WIC. AL is solid.
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Dec 17, 2012
How do I access the router's web gui management? I already enabled the ip http server and ip https commands. I have a username and password configured
I open a browser session with the ip address:URL, But I do not get the management GUI. I haven't used the GUI in many years,
Cisco Systems
Accessing Cisco CISCO1921/K9 "my-router"
Show diagnostic log - display the diagnostic log.
Monitor the router - HTML access to the command line interface at level 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15
Show tech-support - display information commonly needed by tech support.
Extended Ping - Send extended ping commands.
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Dec 15, 2011
I have a Cisco 1921 in place with the security IOS so it is also acting as a firewall.
I am wondering if I can enable the GUI so I can configure it remotely.
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Nov 8, 2011
I need to know how many IPsec VPN tunnels one Cisco1921 can support reliably. Haven't had any luck sifting through documentation on the web.
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Jun 9, 2013
We have a 1921 router that has WebVPN (Any connect) enabled on it as well as IPSEC. When a user logs in using IPSEC client they stay connected no issue. IF you connect using Any Connect it will disconnect you after exactly 10 minutes. Never a second more or less. I ran some “debug webvpn” and the disconnect looks to be a planned event and reports no error it just sends the disconnect command. However, if you watch the buildup you get the following message from Debug.
003960: Jun 7 09:09:06.833 NewYork:
003961: Jun 7 09:09:06.833 NewYork:
003962: Jun 7 09:09:06.833 NewYork: [WV-TUNL-EVT]:[3318C168] CSTP Version recd , using 1
003963: Jun 7 09:09:06.833 NewYork: [WV-TUNL-EVT]:[3318C168] Allocating IP 172.18.249.50 from address-pool IPRange1
003964: Jun 7 09:09:06.833 NewYork: [WV-TUNL-EVT]:[3318C168] Using new allocated IP 172.18.249.50 255.255.255.255
003965: Jun 7 09:09:06.833 NewYork: [WV-TUNL-EVT]:[3318C168] Full Tunnel CONNECT request processed, HTTP reply created
[code]....
The highlighted entry is a session timeout set for exactly 10 minutes. I cannot find how to change, remove, or modify this setting. Google has failed me in my ability to find this timeout setting.
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Apr 11, 2011
Have a cisco router 1921 ,version 15.0,configuration register is 0x2102 and did not remember the password try to solve by GW-RTR>confreg 0x2142 give error translating "confreg"....domain server (196.46.100.2) (196.46.104.2) %Bad IP address or host name translating "confreg"....domain server (196.46.100.2) (196.46.104.2) %Unknown command or computer name, or unable to find computer address also tried this GW-RTR>confreg 0x2102 give error translating "confreg"....domain server (196.46.100.2) (196.46.104.2) %Bad IP address or host name translating "confreg"....domain server (196.46.100.2) (196.46.104.2) %Unknown command or computer name, or unable to find computer address what are the way forward to get to default settings?
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Mar 27, 2012
I have recently configured a cisco 1921 router for internal routing on my network. Here is what i am trying to accomplish:
Main network 10.65.1.0 mask 255.255.255.0- all office devies and computers.
Second network 10.65.2.0 mask 255.255.255.0 - All plant equipment machinery and production lines
i have configure gig 0/0 for my company network and gig 0/1 for my plant network. I can ping the router from both networks but am unable to route traffic betwenn them. what am i missing?
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May 20, 2012
i'm having some trouble setting up the correct NAT configuration of a Cisco 1921 router. The NAT is not working as I want - I think my configuration is wrong somewhere. All clients in 172.16.0.0/24 have the correct outgoing address of 1.1.1.3. But the NAT for 10.10.0.4 (and 10.10.0.5, 10.10.0.6) is partially broken: Ping and ssh from the outside world to 1.1.1.4 is "natted" to 10.10.0.4 and works as expected. But from inside (172.16.0.0/24) ssh to 1.1.1.4 should be "natted" to 10.10.0.4, but doesn't work (ping works). ssh from 172.16.0.0/24 to 10.10.0.4 (without doing NAT) works.
network design:
===============
172.16.0.0/16: network for normal use
192.168.64.0/24: network for specific clients and servers
[Code].....
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Jun 14, 2012
What is the Cisco 1921 router performance if connected with 2 Giga Ethernet port? What is the performance if enable GRE tunnel ?
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Dec 13, 2011
i installed Data license(Evalutation) initally it took the license after reload, when i enter sh lic command the out put shows that Data license is installed and valid for...
But when i run sh ver command it only shws ipbase license and not the data license
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Nov 29, 2012
I have a brand new 1921 router that I can't login to using cisco/cisco. Is there a new password?
[URL]
I don't have physical access so I can't reboot it until Monday. Just wanted to get it working today.
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Jan 18, 2013
I have a Cisco 1921 to replace our current router which is constantly freezing. We have a couple inside servers, one is a web server and application server which needs to be RDP'd to by a couple of clients outside of our network. I cannot get this to work no matter what. I know it's not the server's setup as when I plug the network back into the old router, it works just fine.
All clients have access to the internet, and I can successfully ping/resolve hosts from both the router and a client computer connected. I cannot, however, rdp using neither our public IP, nor our hostname. The hostname does resolve to our ISP assigned IP, but the server cannot be contacted, leading me to belive this is a NAT issue. [code]
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Oct 15, 2012
I Have installed HWIC-2T card in my cisco 1921 router but it is not able to detected in router. find the ver of router
Cisco IOS Software, C1900 Software (C1900-UNIVERSALK9-M), Version 15.1(4)M4, RELEASE SOFTWARE (fc1)
Technical Support: [URL] Copyright (c) 1986-2012 by Cisco Systems, Inc.Compiled Tue 20-Mar-12
[Code]......
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Jan 26, 2012
How do I chose a router? Network has about 100+ devices across a campus with remote sites connected thru metro-e.Thinking of a 1921 to use as core router.
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Oct 20, 2011
I have the following setup:
Cisco 1921 is my core router and connected to it is a 30 Mbit fiberline
VLAN1
VLAN2
Now, the thing is that i want VLAN2 to have a 5 Mbit bandwidth limit to Internet but full speed to VLAN1.
I have played around with Rate limit without success.
I also have access to cisco switches that can limit the bandwidth.
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Sep 10, 2012
Is it possible to bond two T1 lines for increased throughput and for possible failover situations? I currently have the second T1 as just a fail over.
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