Cisco Switching/Routing :: 1841 Access To Individual Sites

Sep 9, 2012

I have restricted access to users using TCP/IP using cisco 1841 router in my organization.
I need to permit some sites for users which are part of work..
The issue here is I cannot ping to the site but able to browse to that site when having internet access, i have permitted range the entire range of that IP's but still no luck.. the site which is not pinging from internet.I have also checked the source code for the root IP but still no luck.

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Protocols / Routing :: Unable To Access Any Sites Except Google Sites

Jul 8, 2012

MY ISP installed one router in my lab.for internet connectivity they mail me steps :connect your Laptop directly to gi0/3 port to check internet connectivity with public ip 1.1.1.x and Gateway with subnet mask after connection I surprised because I am able to access only google sites like gmail,google search etc. but I am able to ping/traceroute all sites.from browser I am able to access only google sites only.In Router no firewall no such access list.

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Cisco Switching/Routing :: 3560 - No Access List On Switches And No Firewall Between Sites

Jul 15, 2012

I have 3 3560 switches which are configured with trunks between them. They run vlan 10, 11 & 12. I have a 'core' switch (switch 1) of these 3 to which an MPLS router is connected on vlan12. I in addition have another switch hanging off the 'core' switch via a routed link (switch 4). I have EIGRP configured as a stub and as such the IP address on the routed link at the core switch end is of a /24 from v lan 1 on the other switch. This makes the route directly connected and therefore distributed via EIGRP stubs. Switch 1 is then exchanging routes with the MPLS router (via EIGRP).
The problem I have is that from any sub net on any switch (switch 1, 2 or 3) I can ping (switch 4). When I try and ping switch 4 from over the MPLS I am unable to. If I trace to the switch I see it reaches the outside of the MPLS router, but is then unresponsive. The same applies if I try to ping switch 1 on Any of the other IP addresses of switch 1 respond.
The MPLS network is a managed solution to which I have no access. I'm told that the MPLS provider is able to ping switch 1 & switch 4 on the 192.168.13.x addresses from a remote router ( I have tried from a switch on the same L2 sub net ( and I don't get a response.
From switch 4 I am able to ping the switch on 1 of it's interfaces (, but not the interface I mentioned above There are no access lists in place on the switches and no firewalls between the sites.

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Cisco Switching/Routing :: 1841 Vlan 5 Cannot Access Internet

Oct 31, 2012

i have router 1841 have 2 interface.i make routing between vlan  by subinterface in router and in switch trunk but vlan 5 cannot access internet

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Cisco Switching/Routing :: 1841 - Access To Web Server On Outside Address From LAN

Jan 22, 2012

I have a 1841 deployed as my NAT device towards internet. NAT is setup so that internal addresses can access WWW. I also have some NAT translations opening speciic ports from outside to inside in the form: ip nat inside source static tcp A.B.C.D 443 A.B.C.D 443 extendable.
Now have an outside address/port setup with a public DNS reference and using NAT from outside to get access to the corresponding inside address. It works when being outside the LAN.
Now to the problem: From the LAN side of the router - i cannot access the public name. I can ping it - but my browser dont find the webserver behind the name. Someone told me it should be setup as "local firewall domain" - and i should set this up as "source NAT".

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Cisco Switching/Routing :: 1841 - No Console Access When Booting - All Green LED On

Feb 29, 2012

today I received a Cisco 1841 Router with a problem i have never seen before. Maybe this my 1st really,really broken Cisco Router. When I power the Router on, the fan and all lights turn on (green) and that's it. Nothing changes, also after minutes of wating. On console i don't get any messages and I already tried every BAUD rate possible. Switched the router off/on again and again. And no, it's obviously not a console problem of my computer, because i tried with different routers.

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Cisco Switching/Routing :: 1841 Need To Block MAC Address / Applied Command Access-list

Sep 4, 2012

I am using cisco 1841 LAN router, I need to block MAC address i have applied the command access-list 1102 deny 0000.0000.0000.0000 mac address..... but it does not work.

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Cisco WAN :: 1841 QoS Set-up For Voice Between IPSEC VPN Connected Sites

Feb 23, 2011

I have 3 sites.  Each site has a Cisco 1841 as its WAN router with a 10Mb direct internet access circuit connected to Fa0/0.  The sites are then connected to each other via site-to-site IPSEC VPN.  (The LAN switches in use at each site are Cisco 3750 series) [code]

Now, Site A has already been set-up with VoIP telephony.   The plan is to extend this to the other 2 offices.Auto QoS has been set-up on the switches and data and voice VLANs created in the same way for each office.
how should/do we extend the QoS for the voice over the WAN to ensure voice quality remains for site to site calls.  And what special considerations do we have to make for it being IPSEC VPN connectivity between the sites?  The actual IP telephony system itself is being set-up by a 3rd party and not a lot of information on their requirements has been forthcoming so far – essentially all we have really been told is that they would like us to “reserve” a certain amount of bandwidth for the voice traffic between each site.

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Cisco Wireless :: WISM2 / Looking Individual Log Of CAPWAP Access Point?

Apr 10, 2013

I have a wireless network running with Controller WISM2 and I also have a NCS.I want to know if there is any way to look of individual log of CAPWAP and LAPWAP Access Points. It is better if I can see it through NCS.

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Cisco Wireless :: WLC 5508 / Where Is Individual Access Point Configuration Saved

Aug 30, 2012

I have 50 WAP connected to a WLC 5508. When I backup the config I don't see the custom settings I put in some WAP. Where are the WAP settings saved at ?

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Cisco Switching/Routing :: 6509 - VSS Between Sites?

Nov 9, 2011

I have been asked to research running VSS between 2 6509's between 2 sites?
I am just going through the whitepapers and need to establish the link requirements for such a setup.
Is it a valid setup?

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Cisco Switching/Routing :: How To Block Sites In 2800

Nov 23, 2012

I have a cisco 2800 router.. (flash:/c2800nm-advsecurityk9-mz.151-4.M4.bin, Version 12.4(13r)T11) configured DHCP, DNS, NATING and Bandwidth restriction...And to stop some social network [URL] i configured ip route Null0 (rang of facebook address) But still i am able to open in my network...
ADMIN-II_2811#sh run
Building configuration... 
Current configuration : 1812 bytes
! Last configuration change at 17:26:33 UTC Sat Nov 24 2012
version 15.1
service timestamps debug datetime msec
service timestamps log datetime msec


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Cisco Switching/Routing :: 5596 - Extending 10Gb/s LAN Between Sites

Dec 14, 2011

For a simple 4x sites design for backup consolidation (3x sites connected to one central site), does the design in the attached JPEG make sense and is the configuration achievable using the specified parts?
Brief Explanation:
- Each site is to have servers with 2x 10Gb/s Ethernet (both teamed/bonded/etc) and one NIC on each of the 2x switches in the site (if possible). Each site will also have 2x Cisco Nexus 5596UP Switch (though the P version may be used instead of the UP).
- Two of the sites are within 10KM of the central site
- The last site is about 35KM from the central site
- It is required to have a minimum bandwidth of 10Gb/s between any site and the central site
- I have specified 10Gb/s LW SFP+ and 10Gb/s LW SFP+ (for the 2x 10KM and 1x 35KM sites)
- are there any special licenses needed?
- as asked before, can such a "simple" design work as-is?
- what sort of single-mode fiber would fit the bill (especially for the 40KM link) - 9nm?

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Cisco Switching/Routing :: 6509 Jumbo Frames Across Trunk And Sites

Oct 25, 2011

I understand that jumbo frames need to be enabled end-to-end. I have two ESX hosts connected at each site. I want to enable jumbo frames for those ports, but what if not all host on the ESX are using jumbo frames, will I have drops and connection failures? So if i have two sites, each with a 6509 connected via a trunk and need to enable jumbo frames for a vlan between the sites how do I accomplish this?If I enable jumbo frames on the trunk link how does that impact other traffic between the sites?

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Cisco Switching/Routing :: 3560 - Setting Up 1gig Link Between Two Sites

Jul 30, 2012

We are having two sites seperated by half a mile and we are using dedicated 100 Meg link at the moment for intranet traffic, and now we got new 1 gig link and I am working to set it up, Service Provider came on site installed two circuits on both sites and fiber connectivity is tested succesfully betweeen sites, now I need to connect the circuits to our network and  make the 1 gig link active to make traffic flow between sites and as well bring 100 meg as standby.
So to brief the issue:
Connectivity at the moment SiteA: Switch1(3560)------100Meg--------.SiteB: Switch 2(3560)
I Want to configure SiteA: Switch 3(4507)------1gig (Active)--------.SiteB: Switch 4(3560) SiteA: Switch1(3560)------100Meg(Standby)--------.SiteB: Switch 2(3560)
simple as connecting a fiber or ethernet link from external circuit on both sites to respective switches on their interfaces and configuring hsrp to enable redundancy. A

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Cisco Switching/Routing :: 1700 ADSL Router - Connecting 2 Sites Together

Jan 23, 2012

We currently have a main network running through a static broadband connecting using a Cisco 1700 ADSL router, everything is working fine locally.

We are looking to rent some space in an office nearby so im going to order another business adsl connection with static IP for this site and i currently have a spare 1800 router.My question is can the cisco routers connect up like a VPN connection so both sites work together and will the connection remain online constantly so from the remote office we can access all our servers from the main network?

Also how does the IP addressing work on 2 sites. The main network uses 10.120.21.x and DHCP is assigned from a cisco router. Does the remote network assign from the same DHCP server or would the remote sites cisco router need to be setup to give out DHCP to local machines. If so what would be the best IP setup to use.

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Cisco Firewall :: Configure ASA 5510 For Individual Server Traffic Routing

Jan 27, 2013

I am wondering if this is possible. We have multiple internet connections with fixed IP's coming into the office. We'd like to use one for FTP backup and another to service our websites. From what i have read a 5510 doesn't do policy based routing, but we'd like to configure our ftp server to use one of the internet pipes and our webserver to use another internet pipe. Is that possible?
We'd have two outside fixed IP interfaces and two internal interfaces. I could then use one of the internal interfaces for the web server and the other for the FTP server. consequently if the internal web server and FTP server use the fixed IP"s corresponding DNS server wouldn't that effectively route all FTP traffic out one interface and all web traffic out the other?
Then the FTP traffic would be NAT'ed to an internal interface and the HTTP & HTTPS traffic would be NAT'ed to a separate internal interface.
Then if each of the internal servers used the corresponding internal NIC on the ASA as it's gateway and the fixed IP's that correspond to the external DNS server, then it would affectively only use that gatway out for traffic? Would that work? Does it should route traffic out those pipes correct? Will the asa support two different next hop routers for the two different interfaces?

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Cisco Switching/Routing :: 2960 - Local Multicast Range Is Not Passing Between Sites

Jan 29, 2012

We found out that only local multicast ip address range is not passing between the sites, any other range is passing, local range is and above.
We have two different datacenters, the internal switch is 2960S (Stacked) with 1-10 vlans and the external switch is 3560E, the external switch is adding another tag (qinq, dot1q), vlan 611, and send the packets to metro line to the other site.
on the other site we have the same configuration.
internal switch from site A is configured with igmp querier and the internal switch port on site B connected to the external switch is configured as mrotuer port.
multicast and igmp is passig between the sites, but the local multicast range is not passing, igmp filterring is configured on all port but no profile is defined and no ports are filterred, on the external switch igmp snooping is disabled.

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Cisco Switching/Routing :: 9000 Jumbo Frames On Routed Ports Between Sites?

Oct 14, 2012

We have a number of sites which have high-speed L2 links which terminate on our L3 switches at each site. The ports are between the sites are placed in routed mode.
I would like to use Jumbo frame between two of the network which will communicate across sites and 1500 mtu on the rest, is this something which is possible?
From my understanding is the mtu is set on the interface therefore if I set the mtu on the L2 link ports on both sites to 9000 then would this cause a problem for the 1500?

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Cisco Switching/Routing :: Simple Routing Not Being Performed 1841

Feb 6, 2012

I'm just getting started with cisco kit so you will have to bare with me.I have a cisco 1841.i have a very wierd issue of routing...i cannot ping and browse through this.

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Cisco Switching/Routing :: 1841 / Routing Through Sub-interfaces Fails?

May 31, 2013

I have a problem accessing my wireless router through VLAN sub-interface on my Cisco 1841 router. My hardware:
Cisco Catalyst 2960 switch ( /24)
Cisco Catalyst 3550 switch ( /24)
Cisco 1841 router ( /24)
Asus RT N66U wireless router ( /24)
Here's my network topology:
I have two VLANs - 10 and 20. 2 DHCP pools are configured on 2 1841's interfaces - /25 and with default router sitting on and respectively. No issues with obtaining IP address from any of those pools.Laptop connects to L3 3550 switch (switchport access vlan 10), which, in turn, connects to 1841 router through trunk (with VLANs 10 and 20 allowed).3550 is connected to 2960 through trunk with VLANs 10 and 20 allowed.Wireless router is connected to 2960.I can successfully ping my wireless router and outside world from 1841 from fa0/1 interface, but not from fa0/1.10 or fa0/1.20 sub-interfaces -  all packets got dropped. My laptop can obtain IP from both pools (depending on port I connect it to), but can't ping my wireless router and anything beyond it.
I attach my configs:Cisco Catalyst 3550:interface FastEthernet0/1 switchport trunk encapsulation dot1q switchport mode trunk switchport port-security mac-address sticky speed 100!interface FastEthernet0/2 switchport trunk encapsulation dot1q switchport mode trunk!interface FastEthernet0/3 switchport access vlan 10 switchport mode access!interface FastEthernet0/4 switchport access vlan 20 switchport mode access!Cisco 1841:
ip dhcp pool Vlan10DHCP network default-router dns-server domain-name home.local
!ip dhcp pool Vlan20DHCP network default-router dns-server lease 0 12
interface FastEthernet0/1 ip address duplex auto speed auto!interface FastEthernet0/1.10 description VLAN10 Sub Interface encapsulation dot1Q 10 ip address!interface FastEthernet0/1.20 description VLAN20 Sub Interface encapsulation dot1Q 20 ip address!
Routing table on 1841:


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Cisco Switching/Routing :: 6509 / Layer 3 Port Channel Between Sites Connected Over Dark Fiber?

May 21, 2013

Has anyone configured Layer 3 port channel on Cisco 6509 switches which are connected over dark fiber between two buildings?

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Cisco Switching/Routing :: 1841 - Static NAT

Sep 2, 2012

I have a Cisco 1841 router at home with version 12.4(13r)T advanced ip services. The setup is extremely simple:
1) PPPOE dialer to my service provider over ADSL
2) Nat overload on the dialer interface.
3) 2 V LAN s one for home network (wired) and one for wireless both v LAN's are connected through interface v LAN s respectively.
My problem is when I configure static NAT to map RDP or any other protocol to inside hosts this does n`t work.
ip nat source static tcp 2222 interface Dialer1 2222
ip nat source static tcp 3389 xx.xx.xx.xx 3389 extendable
ip nat inside source list 20 interface Dialer1 overload

When I open wire shark and sniff the traffic on home computer which is the one I`m trying to reach I can't see any traffic. And While performing Nat debugging I am also not able to see traffic going to that port (for example 3389).

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Cisco Switching/Routing :: 1841 - Using NAT To Expose Certain IPs?

Nov 16, 2011

I've got an 1841 router and am using NAT to expose certain IPs and ports to the outside world so that external users can see internal resources (namely, web sites).  However, I can't seem to get it running such that I can visit the external IP address from inside the network and get the router to turn the request around so that it is redirected back inside the network.  Shouldn't this be possible?  Our previous router (a non-Cisco) was able to do this, but I can't seem to get the new one to do it.
A couple of key config lines:
interface FastEthernet0/0
ip address a.b.c.178


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Cisco Switching/Routing :: Connection Between 1841 And Linksys?

Apr 9, 2013

I tried to connect a 1841 to a Linksys with a static route. I am able to ping from a computer in the 1841 to a computer in the linksys network, but I can't ping from a computer in the Linksys network to a computer in the 1841 network?

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Cisco Switching/Routing :: 1841 Static Nat Mapping

Jan 5, 2013

I guess i am just getting old and forgot how this works, or i have an IOS load with an undocumented feature in it.A customer of ours wishes to have their exchange server appear to the outside world on a seperate IP address as their public pool address the past this has not been an issue, however in the current configuration we are unable to get the source address to appear per the NAT statement it always sources on the overloaded IP.   below is the relevant NAT config,  am i missing something, or have i hit a IOS feature? [code] There is a 45% chance i have forgotten everything i learned on the NOC desk and a 50% chance that it is somethine really stupid and 5% IOS is broken

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Cisco Switching/Routing :: 1841 / Port Forwarding Via SSH?

May 2, 2012

I want to SSH into a Cisco 1841 router and depending on the suffix added to the SSH (i.e ssh 2002), would like it to forward this request to a terminal server.Can this be done?  If so, how does one accomplish this?  I have done something similar with RDP but I was not sure about SSH.

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Cisco Switching/Routing :: What Is The Command To Shutdown 1841

Oct 28, 2012

What is the command to shutdown a cisco 1841 (say, to add a module)? I know how to reload / reboot, but does not seem to find any command with an obvious name.

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Cisco Switching/Routing :: 1841 DNS Updates From DHCP

Jan 19, 2013

I have an 1841 running Advanced Enterprise Services 12.4(22)T3 that is functioning as a DHCP server and DNS server.  What I am trying to figure out how to do is have the DNS service respond to queries about the clients of the dhcp service.  I have successfully enabled it as a caching server for other requests, like "" and "", but what about the hosts on the local LAN?
As an example, let's say a Windows computer connects to the network with the hostname "computer" and receives an IP address from the 1841 with the domain name "".  I would like the 1841 to serve DNS queries for "" with the IP address that it assigned. 

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Cisco Switching/Routing :: 1841 - Set Up Different Privileges On Router

Mar 7, 2012

We have a Cisco 1841 router that requires 2 levels of access, at the moment we have network admins logging in with a single username via SSH and with privilege 15 but we also need our helpdesk to login to run certain commands but not chaneg anything

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Cisco Switching / Routing :: 1841 - How To Use Both 2 Interface For Two Different Vlan

Jan 3, 2013

we've to configure our router 1841 to use both 2 interface Fe for two different vlan (also the second has to go on internet).

Actually we have int Fe0/0 configured with an ip address for lan1 and we will use the second int Fe0/1 with another ip address like for lan2

see below configuration:


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Cisco Switching/Routing :: 1841 Router - CPU Suddenly Hit 99%

Oct 7, 2012

I've never had a router's CPU suddenly hit 99% and just stay like it for hours even after a reboot.  This router really does nothing with regards to CPU, I'm looking at it's CPU history (via SolarWinds Orion NPM software that we use) and it is arounf 1-3% all the time for the past 2 years.
I did a show debugigng and it seems no debugging is running

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Cisco Switching/Routing :: Configuring 1841 With ISP And Static IPs?

Sep 12, 2012

We upgrade our Internet service in our India office which required a new router.  The local vendor suggested an 1841, so that is what we have.  It has two fastethernet ports on it.
The ISP (Airtel) provided the following IP address information:
Public WAN IP  :
WAN IP      : MASK :     : DNS : DNS :


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