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 "google.com" and "cisco.com", 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 "test.net". I would like the 1841 to serve DNS queries for "computer.test.net" with the IP address that it assigned.
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Jan 8, 2013
I am trying to get a 1811 to update routes on a 3750x. My static routes are being redistributed to the switch fine, however my connected networks are not My router has Vlan with several subnets attached.
interface Vlan1
description $ETH-SW-LAUNCH$$INTF-INFO-FE 2$$ES_LAN$$FW_INSIDE$
ip address xxx.xx.xx7.185 255.255.255.0 secondary
ip address 172.90.0.185 255.255.255.0 secondary
ip address 172.99.0.1 255.255.255.0 secondary
ip address 10.170.10.254 255.255.255.0 secondary
[code]....
A host on the xxx.xx.xx6.0 network cannot ping a host on the 10.10.44.0 network. All ports on the switch and the router are in vlan1
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Sep 5, 2012
I've got LACP-enabled port-channels between a Cisco 3750 stack and a few different switches (some Cisco 3750s and some Juniper EX2200s). The Ciscos are all sending slow LACP updates, the Junipers are sending fast LACP updates (but the Cisco they connect with is responding with slow LACP updates).
I have a couple of questions:
1) what are the pros and cons of slow vs fast updates? my research has led me to the conclusion that fast updates are better for network resiliency as long as you have plenty of bandwidth overhead (which I do at the moment). is there anything to add to this conclusion?
2) is there any way to configure the Cisco 3750s for fast updates?
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Nov 6, 2012
We have several DMVPN-connected sites that are connected to our 2821 ISR pair.They're all configured as eigrp stub connected summary. Yesterday, a few of the sites went inaccessible, but the VPN tunnels were still up and running. Upon further investigation, we noticed that the remote sites stopped receiving routing updates from our 2821's. As a quick fix, we added static routes to bring the sites back up.Later that night, we removed the static routes and cleared the eigrp neighbors, hoping it would fix the problem. When it didn't, we cleared them two more times.Suddenly, the router lost all downstream adjacencies. While we were adding statics to at least bring the sites back up, all of the adjacencies came back.
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Nov 1, 2012
I have cisco router 800 series 887 VAW. WiFi is connected to all my devices through this router, i.e., Windows XP, Vista, Wii, Nexus 7 and HTC Desire S. I can access internet from all these devices. The apps which are already downloaded on my Android devices connect to internet, but the bigest problem is here:
1. Google Play does not connect (on both Nexus 7 and Desire S).
2. Chrome does not work on Nexus 7
3. Nexus 7 fails to check for any system update.
4. Fails to sync accounts.
I tried to contact to the company which gave me this router, but they told the problem lies with my tablet. But the tablet works perfectly fine with others networks and Android phone works fine with 3G and other networks.
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Sep 25, 2012
We have currently LMS 3.2 installed. We know have some new switches C2960-48PST-L that are not supported in CiscoView and Common Services.When trying an update in Software Center | Device Update, we receive an error message:Error while downloading package information from Cisco.com for the selected products. See the C:/PROGRA~1/CSCOpx/log/psu.log file for details.
The psu.log file shows the following:
[ Wed Sep 26 14:33:15 CEST 2012 ] INFO [SecurityHandler : getCSProxyLogin] : No proxy User Name configured
[ Wed Sep 26 14:33:15 CEST 2012 ] INFO [SecurityHandler : getCSProxyHost] : No proxy Host configured
[ Wed Sep 26 14:33:24 CEST 2012 ] INFO [SecurityHandler : getCSProxyHost] : No proxy Host configured
[ Wed Sep 26 14:33:24 CEST 2012 ] INFO [SecurityHandler : getCSProxyPort] : No proxy port confgured
[ Wed Sep 26 14:33:26 CEST 2012 ] INFO [SecurityHandler : getCSProxyHost] : No proxy Host configured
[ Wed Sep 26 14:33:26 CEST 2012 ] INFO [SecurityHandler : getCSProxyPort] : No proxy port confgured
[code]....
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Nov 11, 2012
I have some DHCP trouble since I subnetted my network with a 2921. My clinets are in 172.16.2.0/23 and DHCP servers are in 172.16.5.0/24.Sometimes, randomly I guess, I get NACK from my DHCP server, and if I look into DHCP logs I got something like this:
15,11/09/12,09:52:27,NACK,172.16.3.172,switchE51D12.host.com,A0CF5BE51D12,,0,6,,,,,,,,
15,11/09/12,09:52:28,NACK,172.16.3.172,switchE51D12.host.com,A0CF5BE51D12,,0,6,,,,,,,,
15,11/09/12,09:52:29,NACK,172.16.3.172,switchE51D12.host.com,A0CF5BE51D12,,0,6,,,,,,,,
[code]....
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Apr 3, 2012
Have a client wanting to hand out public ip addresses to all clients from a PFSense Firewall terminating the internet connection.
How do I allow the Cisco Switches currently in place, configured with private ip addresses in the 10.10.x.x ranges and Vlans, where the main 3550 layer 3 has defined dhcp scopes for each vlan, to relay dhcp requests from all vlans to the PFSense firewall?
I assume I would take off the currently defined dhcp scopes for the vlans and configure each vlan/switch with the ip helper address and specify the PFSense firewall and that Nat would have to be disabled onthe firewall?
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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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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 (192.168.100.4 /24)
Cisco Catalyst 3550 switch (192.168.100.6 /24)
Cisco 1841 router (192.168.100.7 /24)
Asus RT N66U wireless router (192.168.100.2 /24)
Here's my network topology:
I have two VLANs - 10 and 20. 2 DHCP pools are configured on 2 1841's interfaces - 192.168.1.0 /25 and 192.168.1.128/26 with default router sitting on 192.168.1.1 and 192.168.1.129 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 192.168.1.0 255.255.255.128 default-router 192.168.1.1 dns-server 208.67.220.220 domain-name home.local
!ip dhcp pool Vlan20DHCP network 192.168.1.128 255.255.255.192 default-router 192.168.1.129 dns-server 208.67.220.220 lease 0 12
interface FastEthernet0/1 ip address 192.168.100.7 255.255.255.0 duplex auto speed auto!interface FastEthernet0/1.10 description VLAN10 Sub Interface encapsulation dot1Q 10 ip address 192.168.1.1 255.255.255.128!interface FastEthernet0/1.20 description VLAN20 Sub Interface encapsulation dot1Q 20 ip address 192.168.1.129 255.255.255.192!
Routing table on 1841:
[code]....
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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 192.168.20.3 2222 interface Dialer1 2222
ip nat source static tcp 192.168.20.3 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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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.178 255.255.255.240
[Code].....
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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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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 is.in 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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May 2, 2012
I want to SSH into a Cisco 1841 router and depending on the suffix added to the SSH (i.e ssh myrouter.myroute.com 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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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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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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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 192.168.1.1 for lan1 192.168.1.0/24 and we will use the second int Fe0/1 with another ip address like 192.168.2.1 for lan2 192.168.2.0/24.
see below configuration:
[code]...
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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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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 : 122.181.23.200/30
WAN IP : 122.181.23.202SUBNET MASK : 255.255.255.252GATEWAY : 122.181.23.201Pri DNS : 125.22.47.125Sec DNS : 202.56.250.5
[Code]......
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Dec 28, 2011
what is the latest firmware for cisco 1841 ? is firmware and router IOS image are same ?
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Jun 5, 2012
We currently have a Cisco 1841 router with version 12.4(1c) of IOS using image c1841-ipbase-mz.124-1c.bin. Our goal is to make it so our router can fully support IPv6. The current IOS version cannot. I've seen a site that seems to indicate 12.4T does support with IP Base image but recently had Cisco tell me with the latest IOS release 15.1.4.M4 that I have to use either the "Advanced Enterprise Services" or "Advanced IP Services" image. Did Cisco just remove IPv6 from IPBase in later IOS releases?
Also I've seen conflicting specs on the max amount of Flash and DRAM the router can support. The following link shows that 384MB is the max for DRAM and 128MB max for flash. We're looking to upgrade ours from 128MB and 32MB respectively but as mentioned I've seen it where higher amounts are supported. In fact we bought a backup 1841 to have and it has a 256MB Flash card in it.URL
Last but not least. Where can I find a straightforward documention of this situation where we may have to upgrade our Flash and DRAM and then upgrading the IOS?
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Jan 18, 2012
I have a cisco 1841 running on a 10Mbps Metro-E connection. I recently signed an agreement for a 100Mbps Metro-E. I am wondering if I will need to purchase a new router to support this new connection or will my 1841 be able to handle the traffic.
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May 2, 2013
I am trying to config the following setup in the Cisco 1841. Able to ping the IPs of Vlan1(FE0/0/1), Vlan2 (FE0/0/1) and FE0/1 IPs from corresponding networks. But packets are not flowing to other side.
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Jul 26, 2011
We are running DHCP Server on our cisco 1841 routers with 12.4 IOS. We want to maintian a Database of all the DHCP IP Leases by the server (ie router), the time and date of lease all the information in a Central / Branch Database.
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Mar 17, 2011
I have a data center with virtual desktops and other shared infrastructure serving remote sites, some of which are connected to the data center with GRE over IPsec.
IP address management including DHCP is centralized in my architecture, but I simply cannot figure out how to relay DHCP requests through GRE over IPsec to my DHCP server cluster. I am working with Cisco 800 series VPN peers, and the VPNs are terminated either on a 1841 or a Juniper SRX. Everything else is just fine and dandy, but DHCP is not forwarded across the GRE tunnel.
As a workaround I am forced to use local DHCP pools on the VPN peers, which is extra work from a management point of view, and also precludes static IP address assignment where a local DHCP pool is in a VRF. My LAN devices are mostly thin clients, so I don't care if DHCP stops working when the WAN link fails. As such local pools have no upsides, they are only a tremendous hassle.
My config is very basic, public WAN in global routing table and WAN + GRE tunnel in a VRF. NAT is not used. Here are the DHCP-related configs I have tried:ip helper-address on the LAN gateway, both with and without ip forward-protocol udp bootpcip dhcp pool with relay options configured
In every case, I can see the UDP broadcasts hit the LAN gateway, but relayed packets never arrive at the other GRE tunnel endpoint let alone the DHCP server.
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Jan 9, 2012
we are trying to configure 1841 with dual Internet connection with failover using track.
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Jul 2, 2012
I decided recently to switch out our border router (1841 12.4 advsecurity) with a shiny new 1941 (15.2 SEC/K9) as the CPU upgrade was needed.The core below acts as a VPN end point to various other remote offices we have, all of which have a similar network design at each end (and all entirely managed by me). All of these are still running 1841's with 12.4 advsecurity on them as well. These are all GRE tunnels with ipsec procection on them (not crypto maps). [code]
Everything else works fine (NAT, route-maps etc), it's just these IPSEC/isakmp tunnels that are not playing ballIt's definitely not an ARP issue (all arps were cleared) and ICMP appears to work fine (ie, I can ping the remote tunnel's public IP endpoint from the core using the loopback for that tunnel as the source). I am suspecting it's something strange with the stateful firewall config, but I did try and apply ipsec and isakmp-msft to the ip inspect list, with no success.
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Dec 26, 2011
I have 3725 router with internal CF and external slot for CF. I tried upgrading and ended up deleting the iOS version on the internal flash, and can not now put the iOS back!! I turned it off.... so there was no active iOS..
I have tried formatting the CF card on an 1841 but the 3725 won't read it. It is obviously stuck at ROMMON
What is the correct way to format a CF card so my 3725 will read it and I can get an iOS back on it!!
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Jan 1, 2012
I need to know the Cisco 1841 Router FE Maximum Bandwidth Support and the Cisco 3825 Router GE Maximum Bandwidth Support. I cannot find this information in Cisco for these old devices.I would like to have the platform capability for all situation (only IP base, with QoS, with ACL, with encryption, etc.)
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Oct 22, 2012
I have a Cisco 1841 router connected to a Cisco 2960 switch.Users behind the router can't access the internet but when someone is directly connected to the switch with his PC and uses the IP Address found on the WAN port of the router, he's able to go on to the internet. [code]
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Nov 18, 2012
I have got a l2 link of 512 kbps from two different ISP. I want to aggegrate the bandwidth of this connection so that I can feel like having 1 mbps connection. I am not actually talking about load balancing, but bandwidth/link aggegration. Can we have the solution of failover with different vlan from different isp ? Can we be able to make the link as a single link.
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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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