Cisco Switching/Routing :: Pass Vlans Across FE Ports On 1841 Router?
Nov 6, 2012
due to upcoming changes to our network I'd like to be able to pass vlans across the FE ports of a Cisco 1841 router.1 port would go to a managed switch and then to local devices on different VLANs.the 2nd port would go upstream to a Cisco 3825 at a different location which would then connect to the internet.due to monitoring behind the Cisco3825 we would like all NAT to occur on the 3825.
what I would like to happen is this example device connected to port 7 on managed switch gets an IP (10.0.7.10) from the Cisco 1841 in VLAN 7 (10.0.7.0/24).traffic from that device goes to the switch, then in f0/1 on the 1841 and out f0/0 still with the same IP info, no NAT occuring.traffic is received on the 3825 port 0/1 and then NAT occurs and out port 0/0 to the internet.
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May 12, 2012
Any simple way of opening ports on a 1841 router.I have a working config for internet traffic. I am looking to boot up my Windows Server and Run IIS.
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Nov 5, 2011
I have 1841 router with Gigabit Ethernet HWIC with One SFP Slot installed in it and connected via SX Multimode cable to 2950 switch. I have 5 VLans in trunk. The question is what will be the speed rate between VLans - 1 Gbps or less?
The case:
Port 1 assigned to a VLan10 and Port 2 Assigned to a VLan20 on 2950 switch.
InterVLan routing is configured on 1841.
Computer A is connected to Port 1 and Computer B is connected to Port 2 on the switch.
What be a file transfer rate from Computer A to Computer B assuming that NICs on both computers are 1000Base-T.
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Oct 9, 2012
This is existing network diagram and find attached file for configuration of Router and L3 Switch:ISP provided 6 Mbps internet access link with ethernet Handoff which is terminated over Cisco 1841.ISP also provided pool of 30 Public ip's 125.63.74.33 /27 , range from 125.63.74.34 to 125.63.74.62.In my current setup, all Inside to ouside traffic going out through 125.63.74.34 public ip because this public-ip NAT overload with Router F0/1 interface.
1) I want to divide 6 Mbps link physically into three parts 2Mbps, 2Mbps, 2Mbps for three VLANs.
2) I want to also configure each vlan IN/OUT traffic with different Public ip. is it possible or not ?
Vlan2 = 172.25.162.0 /24 => Inside to outside / Outside to inside traffic through 125.63.74.40
Vlan3 = 172.25.163.0 /24 => Inside to outside / Outside to inside traffic through 125.63.74.41
Vlan4 = 172.25 164.0 /24 => Inside to outside / Outside to inside traffic through 125.63.74.42
How can i configure above desired setup with CBWFQ
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Oct 9, 2012
I have a test switch (Cisco 3550) that I want to set up with 6 Vlans and 2 trunk ports. I want to be able to access a virtual server conected to the trunk ports from the switch ports. Ports Fa0/1 to 8 are in a vlan port fa0/9 to 16 another vlan etc. Ports Fa0/47 and 48 are the trunk ports. This is a lab environment so the the switch is the only device being used.
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May 1, 2013
I have a Cisco 1841 that has an ADSL (ATM) card installed. It was previously used with an ADSL line to provide NAT routing for an office. Now I want to use it witha cable modem, which would mean abandoning the ADSL interface and instead routing between the two Ethernet ports.Between the Cisco and the LAN is a Linux transparent proxy. It provides routing between 192.168.1.0 (LAN) and 192.168.2.111 (Cisco LAN interface). The network looks like this:
Cable Modem(174.76.21.1)(gateway) --- (174.76.21.10)(WAN) Cisco 1841 (LAN)(192.168.2.111) --- (192.168.2.11) Linux Proxy (192.168.1.10) --- (192.168.1.0) LAN
For testing and diagnostics, I've connected a laptop to each FastEthernet port on the router. One laptop is configured with the IP 174.76.21.1 to simulate the cable modem gateway and the other laptop has the IP 192.168.2.11 to simulate the Linux proxy. From those systems I've performed the following diagnostics with the following results:
From 192.168.2.11
Ping 192.168.2.111 - OK
Ping 174.76.21.15 - OK
Ping 174.76.21.1 - Timed out
From 174.76.21.1
Ping 174.76.21.15 - OK
NAT translation to LAN IP's failing
There are some vestiges of the ADSL configuration, but I've cleaned most of it out and shut down the ATM interfaces. Here's my config:
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
[code].....
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Dec 28, 2011
Our bank is required to do disaster recovery testing. We are doing this offsite at one of our director's businesses. His setup is as follows: His ISP is Time Warner which provided him with a wall unit and a switch He has a Cisco 1841 router out from the Time Warner switch and then down to his internal network, so TW wall unit --> TW switch --> Cisco 1841 --> internal network.The IPs provided to them from TW are 74.219.xxx.1-254 We are trying to use the external address of 74.219.xxx.222, which his business is not currently using internally The Cisco 1841 router holds and NATs all of these addresses currently. We have a Cisco 800 series that is a dedicated router that needs an unused external static IP setup separate from their network. We were trying to plug into their Cisco 1841 and give the 800 series an internal address of 192.168.xxx.222. This will not work for our bank's core processing data center. It has to be out of the TW switch and have an address of the 74.219.xxx.222.
We tried plugging into the TW switch and making the 800 series router parallel to the 1841 router. Communication is not functioning when set up this way. This was tried on a laptop before using the 800 series router. Is there a way to pass through the 74.219.xxx.222 address internally through the Cisco 1841 so we can connect the 800 series directly to this address and the 1841 doesn't use or NAT it in any way?
We had contacted TW support and they made it sound like we would have to block out some addresses and resubnet our director's network. This probably will not be an option. Basically we need to pass the 74.219.xxx.222 addresses internally and have the Cisco 1841 pretend not to see it at all.So we would like to have 74.219.xxx.1-254 into the TW wall unit --> TW switch --> Cisco 1841 --> all 74. addresses resolved to 192.168.xxx.1-254 to internal EXCEPT 74.219.xxx.222 which would pass through to the Cisco 800 series router.
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Nov 15, 2011
We're trying to get a remote access setup for someone who needs to have access from offsite. To make things easy we set it up with a virtual machine running Windows 7 and RDP. Because the "other end" isn't our computer and we've had some difficulties with people using the Cisco VPN client successfully, we were just going to set up a machine as a RDP Gateway and forward the port through the firewall (WebVPN might be nice, but the plugins only do RDP through v5.x). I've tried this on 8.4-1 and after reinstalling the latest 8.2, and supposedly the NAT works and there is a firewall rule allowing access from the outside to the RD-GW server on HTTPS, but the ASA is still blocking those packets. I've looked at 4 howtos and followed them, trying from the console and from ADSM (and one trashed the whole setup, probably related to the reinstall of 8.2) - [code]
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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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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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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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Apr 26, 2012
just a simple question. Is it possible to use a nexus 5548 UP switch as a layer 3 router between different vlans on the switch without the layer 3 card ? Or is there no 5548 as a router with the layer 3 card ?
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May 12, 2012
I got a Cisco 2800 router and am planning to use FastEthernet 0/1 to trunk in 802.11Q VLAN's to cater for some of our radio links. speed and operation of the sub-interface that will be created. Or explain it here. We got a radio link that we want to trunk into this Cisco 2800 and it is suppose to be connecting at 100Mbps but currently operating at around 80Mbps. Reports shows that the max in and out traffic for this link this year till today is 25Mbps. Will it not fail teh CPU etc ?
interface FastEthernet0/1
no ip address
!
[Code]....
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Dec 19, 2012
I have two Catalyst 2960 Series (48 port) switches with the newest Cisco IOS installed. There is also a Cisco 2600 Series Router which I can't manage because it's ISP managed.
Now the problem is as follows. I'd like to create two VLANs, one in the IP range 192.168.0.xxx and the other in the 192.168.1.xxx. Now the router has a gateway IP address 192.168.1.1 .
Would it be possible to somehow connect these two VLANs with the router so that these 2 VLANs can't see each other but they can ofcourse both contact the router and exit on the internet?
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Feb 19, 2012
WAN1 <-> LAN traffic
WAN2 <-> LAN traffic
WAN1 <-> WAN2 traffic?
Say, it is set DISABLED, what is / isn't blocked?
It reads: Multicast Pass Through IP Multicasting occurs when a single data transmission is sent to multiple recipients at the same time. Using this feature, the Router allows IP multicast packets to be forwarded to the appropriate computers.
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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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Mar 16, 2013
establishing a Static NAT on an 1841 router.
I'm at a FOX affiliate TV station, and in order to connect our EAS Device to the internet & Fox Splicer, I need to setup a Statio NAT, so we picked up an 1841 on eBay.
I've done a little configuration in HyperTerminal.
I've done these ip addresses:
FE0/0 10.1.10.13 this is the subnet our EAS device is on
FE0/1 10.110.81.174 this is the subnet of the Fox Splicer.
I need to have NAT translate 10.1.10.11 to 10.110.81.170 and I also need to set a route for 10.110.81.0/24 pointing to 10.110.81.161
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Sep 16, 2012
Hava cisco router 1841 forgot user name and password and need to reset it to its factory setting
tried boot while holding ctrl and break get into rommon1>
rommon1>confreg 0*2142
rommon1>reset
still shows rommon 3>
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Jan 6, 2012
I have the following devices for our IT Test LAB
1. Cisco 1841 with 2 Fast Ethernet interfaces fa0/0 & fa0/1
2. Cisco 2960-S
3. Speedstream 6200 DSL Modem ( PPOE Connection with Static IP address)
I want to connect to the internet using the current DSL connection we currently have .
LAPTOP --> SWITCH 2960 --> ROUTER 1841 ---> DSL Modem ---> ISP
Troubleshooting 1: Currently from the LAPTOP i am able to ping
1. Switch 2960 Vlan interfaces
2. Router 1841 fa0/0 & fa0/1
BUT can not Ping the DSL Modem LAN interface IP 192.168.2.1 and can not get out to the INTERNET
Troubleshooting 2:currently from the Switch 2960 i can ping
1. All the Vlan interfaces on the Switch 2960
2. Router 1841 fa0/0 & fa0/1 interfaces
3. Laptop A & B
But can NOT ping the DSL modem LAN interface IP 192.168.2.1 and can not get out to the internet
Troubleshooting 3:Currently from the Cisco 1841 router i can ping
1. All the Vlan interfaces on the Switch 2960
2. Router 1841 fa0/0 & fa0/1
3. Laptop A & Laptop B
4. Can Get out to the internet. I am able to ping any internet destinations without any problem
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Aug 27, 2007
We have a customer that is relocating thier headquarters. They have a temporary requirement to bridge multiple vlans or a router T3 link to the new location as they cannot change the IP subnets. Setup is 3560 switch connecting to a 3845 then T3 to remote 3845 and 3560. I need to bridge multiple VLANs. I have seen a good example on how to do it over sonet but I don't see how to translate that to an HDLC or Frame Relay encapsulation for the T3 Link.
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Jun 1, 2012
I am trying to configure router on a stick with 2811 and 3750, but I just cannot get it to work - vlans are not getting propagated from 3750 to 2811: 3750:
Code...
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Apr 17, 2012
I've just started a CCNA course and my lack of knowledge has me a bit stuck. My network is comprised of Cisco components and I'm semi familiar with them just from reading and looking through options. I currently am using a Cisco ASA 5520 on my network and I am trying to join another network via one of the interfaces. My network is 192.168.0.0 255.255.0.0 and my inside interface is 192.168.1.1 255.255.0.0. I enabled a second interface using a static ip of 10.0.0.1 with a subnet of 255.255.255.128. Connected to that interface, I have a Fortigate firewall at 10.0.0.2 255.255.255.128. I can ping just fine from the Fortigate network to the 10.0.0.1 interface on the Cisco ASA 5520 network, but I can not ping the 10.0.0.1 interface (or anything past it) on the ASA 5520 from any computer on the Cisco network. I've read that ACL's and NAT have to be done as well as enabling traffic between interfaces with the same security levels. (both interfaces have security levels of 100 and the option is checked to allow traffic).
Note: each network has it's own internet connection. The connection is to share information on servers on both networks with each other.
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May 22, 2013
|_voip PBX___|-----|__3650___|------fiber-------------|__3650_____|------|_voipphone__| I have a case where voipphone is registered on the voippbx but peaple on both end can't hear each other . No ACL on both 3650 , no firewalls between them , distance is about 2 miles . I tried to make telnet x.x.x.x 1720 or 1719 or 1721 (h323 ports) to opposite switch -connection refused . How can test if ports are open on the 3650 ? Is it coorect If I create allowing acl and apply it on both 3650 on the interfaces connected one switch to voippbx "IN" , second switch on the interf connected to voipphone "IN" ?
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May 12, 2013
I have 10Mbps internet speed connected to ciusco router 1841 that has 2 internal NICs. One NIC has a full 10Mbps download speed and the 2nd NIC is currently limited to 1Mbps download speed. I want to change the download speed of the 2nd NIC to 4Mbps? How do I do this on a cisco 1841 Router?
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Dec 22, 2011
The issue is occuring on our local LAN where my ARP requests are being modified after a period of time by the router for one host. I'm finding that the host will work fine with the correct MAC IP pairing for a period of time and then about 15-30 minutes later, the arp table is changing so the associated mac/IP address is now the mac address of the router interface.
The FastEthernet 0/1 port has no ip proxy-arp enabled and is set with ip nat inside.This only started happening after restarting the router, however the running config was saved as the startup config prior to the restart.I've tried hard-coding the entry with the command arp 10.15.4.190 c82a.1459.0579 ARPA however that is not working as expected.
The device is an 1841 ISR with the advanced IP Services bundle loaded. Is there some way that the router is viewing my host (provides DNS, Directory Services) as a intrustion attempt and somehow rejecting the packets?
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May 26, 2013
We have a setup of a firewall in between my Cisco 1841 router and Switch.
Cisco Router --> Meraki Firewall--> Switch
Client VPN is configured on the Meraki Firewall but then for the outside users to client vpn in to the network, I have to port forward or open the ports 500 and 4500 to the IP address of the Meraki Firewall 192.168.1.90. [code]
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Nov 14, 2011
We have a 1841 Cisco router for one of our remote sites and we have the GRE over IPSec tunnel on it (with our datacenter router) for the connectivity. The LAN facing interface becomes UP/Down (status 'UP', Protocol 'Down'). When I login the router and 'shut' and then 'no shut' the interface, the interface becomes UP and everything starts to work. Traffic starts to flow across it. But after some time, some hours or sometimes some days, the interface is again back to up/down status. The router is connected to a non-Cisco switch. I do see some CRC's increasing very slowly, but apart from that there seems nothing wrong with the interface in sho int fas0/0 command:
!
RTR01#sho int fas0/0
FastEthernet0/0 is up, line protocol is down
Hardware is Gt96k FE, address is 0026.cb91.ee48 (bia 0026.cb91.ee48)
[Code]....
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Feb 12, 2012
i want to create a trunk between 4507 & 3945E router & route two vlans from router 3945E
4507# vlan 99 & 51
# int vlan 99
# ip add 10.22.100.1/24
#int vlan 51
# ip add 10.22.103.1/24
[code].....
4507 version : IOS-XE Software, Catalyst 4500 L3 Switch Software (cat4500e-UNIVERSAL-M), Version 03.02.00.SG RELEASE SOFTWARE (fc4)
3945E: 15.1(2)T4 what I am missing?
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Sep 4, 2012
I have a problem, here are the situation
- 1 Catalyst 3750
- 1 Catalyst 2960
- 4 Finger Print
- 1 HUB
Configuration
- Catalyst 3750
Interface VLAN182
IP Address 10.62.182.254 255.255.255.0
Interface G0/2
Description Finger Print Server
Switchport mode access
[code]....
Here are the problem,If i connect Finger Print Device to port catalyst 2960, some device not sending data to server, but if i connect all Finger Print to HUB and from HUB connect to Catalyst 2960 at port F0/5, All Device(Finger Print) can send data to server...Is there any special configuration in catalyst so all device can direct connect to port catalyst 2960 without HUB?
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Nov 2, 2011
I want to know is it possible to check Internet speed directly in the cisco router thru any command or activating any service in the cisco router?.As it is seen most of the times internet speed offer by ISP is different as compared to clients.and Clients most oftenly not satisfied with internet speed The problem is that our ISP has given us 100MB leaased line.But when we deployed in production network the speed is same as DSL.We have reported this issue to ISP they then carried out Iperf test by connecting laptop directly with the ISP router.They have tested the speed and it shows about 94-96 Mbps and argu that it is up to the mark and there is problem at your side(i.e our internal network).Now our internal network has cisco 1841 router connected directly to ISP 3825 cisco router.Our router has minimum configuration as required to pass traffic out and in.Our internal 1841 router is connected to switch to which different clients are connected.We have performed some online tests using different speed checking websites and also perform real time tests by uploading and downloading files.The speed is much low as compared to 100Mbps and it is nearly or slightly higher then as DSL connection. how can we check internet speed in the specified scenario?Is there any command or service available in cisco router to check internet speed as we want to check ISP connection speed directly thru 1841 router?what about authenticity of online speed checking websites?Any specialize software/tool you recommend to check Internet speed in specified scenario?
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Nov 9, 2012
I've moved a Cisco 887 router from a site where it was used to dial up on an ADSL line to a new site where we have a EFM circuit which terminates at a Cisco 1841 router managed by our ISP. I therefore need to re-configure our 887 router to work as a conduit from our servers back to the Cisco 1841 as its gateway.
I have asked from our ISP and they told me that i need to configure the 887 to use IP address 176.35.140.65 255.255.255.248 and its gateway should be 176.35.140.70. That's great advice in theory but I don't know how to configure this correctly
Our internal network is using subnet 192.168.42.XX which will need to be retained for local devices.
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Sep 18, 2012
We have a design of two 6509 running in a VSS with dual supervisor each having fthree 10/100/1000mb etherner modules. We have diagnosed a wierd problem that none of the switchports in module 1 and 2 on either switches are having layer2/layer 3 connectivity.
Tried everything from changing the cables to changing the end device but no luck with it.
Module results show pass and no errors in the logging.
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Mar 27, 2013
I have a SM-ES3G-16-P in a 2951. Is there any way that the service module interfaces can be transparent to the host router. Essentially I want the SM to act like an HWIC-1GE .. only with more ports!
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