Questions tagged [ios]
The operating system used on the majority of Cisco's routers and switches; a package of routing, switching, internetworking and telecommunications functions tightly integrated with a multitasking operating system. For Apple's mobile device OS, use apple-ios.
309
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Cisco 3925/k9 sub-interface vlan support
I've got a brand new cisco router 3925/k9. I wanted to set up a router on a stick on my network, but it turns out it doesn't support vlan sub-interfaces. I did it multiple times in gns3 simulator on ...
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3
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cisco catalyst 2960S, which version of software to upgrade to?
This feels like a dumb question, but here goes.
I have a Cisco Catalyst 2960S switch that is currently running software version 12.2(55)SE3
The most current software listed on Cisco's website is 12....
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1
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Cisco IOS subnet mask using bit notation
I was wondering if it was possible to use bit notatiton when configuring interfaces, or just in general, within the CISCO IOS. I have friends and others swear that they've been able to before, but not ...
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1
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How to setup a static multicast ARP entry with Cisco SG300?
We're running a Microsoft NLB cluster in multicast mode as a loadbalancer. Using our old Cisco IOS switches we propagate access to the cluster to our branches using a static ARP entry in the core ...
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3
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Why is my router CPU at 40% when no processes use more than 2%?
I have a problem, I have a Cisco 1841 running Cisco IOS 15, and I get strange behavior. The CPU usage is shown as 40%, but there is no processes that is using this much CPU power.
Here is an example:...
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3
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What does the Cisco ASA command "management-access" do?
I'm working with a Cisco ASA 5510. I changed the management interface to a different interface. I used the command "management-access" to get the new interface working, but the old interface ...
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1
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Allow my OpenVPN server to work behind a Cisco 800 Router
I have an OpenVPN Ubuntu Server working on ip 192.168.1.11
I need to let my roadwarriors use it from anywhere.
I have a Cisco 800 router but I'm not an expert...
I've downloaded using tftp its ...
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1
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IP SLA on Cisco 1921 IOS 15.2T
Can someone explain to me why I cannot create IP SLA probes on a Cisco 1921 with the latest IOS (15.2T). It is clearly available for that IOS on that router model on the Cisco Feature Navigator ...
...
- 302
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Cisco 12.4 ACL with DHCP-obtained address
I figured this would be an easy one, but I've had a good amount of trouble finding this answer myself. I have a Cisco router that I'm setting up to have my Internet connection on one interface (...
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How to redirect Cisco IOS's show output to HTTP URL?
I found there's a redirect output modifier of Cisco IOS ( version 12.2(53)SE1 ), and there's http: URI support:
#sh version | redirect ?
flash: Uniform Resource Locator
ftp: Uniform Resource ...
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Cisco 871 IOS BVI: Distinguishing incoming and outgoing
I understand that a BVI is very much equivalent to a network switch. But it includes the benefit of being able to have an access control list.
I am doing this, but I would like to more effectively ...
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3
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Why do I start at privilege level 1 when logging into a Cisco ASA 5510?
I have created a test user that is set to privilege 15 in the config:
username test password **************** encrypted privilege 15
When I log in to the ASA 5510 I am in privilege 1 according to sh ...
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2
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What characters are illegal in Cisco IOS username secret passwords?
I am using username secret to add users with encrypted passwords to our switches and firewall.
I have been battling with the same switches and firewall for a couple of hours trying to get securely ...
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How does Cisco IOS ACL established flag work
You can permit outgoing packets, but then you need to permit the responses. One way is to permit any packet that is a followup to an established connection.
access-list ??? permit tcp any any ...
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How to delete multiple files from a Cisco router flash memory
I have filled up my router's flash with voice files and folders and wanted to remove them. I there a script that can delete all files in flash except for the IOS image?
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Can we route video on my redundant link while the primary is up and turn it off if the primary fails over to secondary?
We have a remote location that is currently routing data over a satellite connection.
I am adding a cellular fail over if the satellite goes down.
I have been asked to install video cameras that ...
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1
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Cisco IOS port forwarding
I'm trying to forward a port to an inside server. I have tried using static nat to forward it and I have opened it up in the access list as far as I know but I can't seem to get it to open.
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How do I setup dynamic VLAN assignment on an autonomous Cisco 1142n?
I've gotten my Cisco 1142n autonomous AP configured with every option under the sun, but I still can't get dynamic VLAN assignment working!
I verified the following:
I give priority to VLAN ...
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1
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Cisco NAT - Sharing single public IP with multiple services
We have this setup on a SonicWall firewall, but I can't for the life of me figure out how to do it on a new Cisco 5520. Here is what I want to do
External_IP1:25 --> InternalMailGW_IP:25
...
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5
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606
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Cisco 2811 to Forefront - stop broadcast traffic
I recently upgraded from an old ISA to a Forefront box. I'm now receiving a ton of 0xc0040050 errors. The vast majority are to an internal broadcast address - 100.100.100.255. This is a legacy subnet ...
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Forwarding a port internally - Cisco-881
I have a Cisco 881 on which I forward traffic coming from outside to an internal IP, but if an internal IP accesses the external IP, it gets the Cisco HTTP Server (or a broken connection if i set no ...
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3
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How to advertise routes to IPSec tunnels in OSPF using Cisco IOS
I have Cisco 1800 series router (running C181X-ADVIPSERVICESK9-M) with lots of IPSec tunnels. I want to add this router to OSPF and configure it to advertise routes to remote subnets accessible via ...
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In which cisco router or IOS verson i can use section command like "show run | section eigrp"
I have seen videos in CBT nuggets for ccnp and ccna.
The instructor always uses show run | section eigrp and it looks very good command
But i am trying that in GNS , it says command not found
How ...
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1
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435
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Trunk port wont accept the Printer vlan
I have three switches daisy-chained together and I have a printer vlan serviced with a print server off the core (1st) switch. the middle switch trunk port will not accept the printer vlan. I issue ...
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3
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722
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Delay NTP Initialisation, Cisco 877W, IOS 12.4(24)T1
I have a Cisco 877W which I'm using for my home ADSL connection (and as a refresher in Cisco IOS). I've got a working config in-place with my PPPoA connection coming online correctly, and VLANs and ...
- 1,254
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1
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Output Drops on Cisco Switch -- Counter?
I was always under the impression that the Total output drops was a counter that goes up until it resets (or maybe wraps around 4 billion).
However, this seems to indicate otherwise, or something is ...
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1
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Can somebody please explain IOS line authentication?
I'm trying to understand a config on one of our Cisco routers (teaching myself iOS) and have run into a problem with one line.
Can somebody please explain the "line enable" piece of the command below ...
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How to obtain Cisco IOS firmware?
Quick and simple question, but I've not been able to find an answer around.
I have a Cisco ADSL router (model 877).
I don't have any Cisco support contract.
How can I obtain an updated firmware for ...
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Cisco ACL Not Applying
This is probably something extreamly simple but I am executing the following code to block usage of port 80 on ip 192.168.1.50 and it does not seem to be working. The interface is right and I am using ...
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Cisco XR Interfaces
I'm trying to figure out if a device which is running Cisco IOS XR is affected.
The advisory is published here
Assuming I have the vulnerable OS versions, Now I want to check if I have a Cisco Line ...
- 307
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How to disable ICMP redirect packets in Cisco IOS?
I'm studying a "good practices" document for Cisco IOS, and one of its controls tells me to disable ICMP Redirect packets in the router. Sounds reasonable. So I go test it in Cisco Packet Tracker (a ...
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Cisco IOS XR version clarification
I've run across this cisco advisory
It says:
This bug was introduced in Cisco IOS
XR Software release 3.6.2 and is fixed
with SMU hfr-k9sec-3.6.2.CSCtd74795.
The SMU ID for this fix in 3.6.2 ...
- 307
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1
answer
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cisco 870 assign IP
I'll try to be "short." I've successfully enabled http server option on my Cisco 870, now I need to reach it and use the web based configuration. I haven't found how to assign an IP to the router ...
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4
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Cisco 1800 series router simulation program
I need to know how to program these routers for school, but I need to exercise at home. Are there simulators for the console interface, for learning purposes? I took a look at eBay to get one, but ...
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Will cisco 3750-e switches run the old ipservices ios code?
was wondering about cisco 3750-e switches. Will they run the old ipservices ios code? Or do they only run the univeral image?
Thanks
Jude
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2
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Cisco Terminology: flash and nvram
I'm a student that will be taking my CCNA exam in early June and I'm doing a lot of practical revision, I tend to get sidetracked by little things such as this question I'm about to post. It's ...
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Simple Multicast Design
In order to support desktop imaging requirements I need to correct the multicast design on an existing network, but am not well versed in this subject. The diagram below gives a basic example of the ...
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135
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ios: how to stop output of a show command
Can anyone tell me how to break output of a show command in cisco ios?
Say I don't want to see all of 'show run' and I got the info I need, what keys can I press to stop it from printing the rest of ...
- 1,151
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3
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Configure hairpinning on Cisco 871 IOS 12.4(15)T4?
I'm a newbie to IOS. In the past I've used consumer routers which seem to have the smarts to automatically route requests to internal hosts addressed by their public name back to the internal network. ...
- 135
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1
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Cannot login to Cisco 2911 over ssh?
30 minutes ago my router is not accepting ssh connection. Well, ports is open (due to nmap), ssh simply hangs on reading from Cisco socket (observation from strace):
/home/rafal/.ssh/id_dsa-cert type ...
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Is there a Cisco IOS command that will show DIMM info per slot?
I have a Cisco 2811 with 256MB DRAM. I know this because show version tells me so. I want to upgrade it to 768MB. I know that this takes 1 - 512MB amd 1 - 256MB DIMM. I know that the 2811 has 2 ...
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Can't enable IPv6 in Cisco 2800 router running IOS 12.4T
I can't enable IPV6 in a Cisco 2800 router that runs iOS version 12.4T.
I followed the summary steps section in Cisco's web page . But whenever I type "ipv6" on the command line (as in 'ipv6 ...
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Cisco 2610XM: Advanced Enterprise vs Advanced IP Services?
What are the differences from the Adv. Enterprise firmware and the Adv. IP Services?
From the 2610XM perspective.
Regards,
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1
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214
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More than 8 classes in a policy-map - Cisco 3560
It appears I am limited to 8 classes per policy-map.
Here is the error message when using the Cisco Network Assistant:
The policy "policy-name" contains more
than 8 policers, which means it ...
- 115
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3
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List Of Cisco IOS Devices
I want to start playing a bit with Cisco IOS and I have a Cisco WAP200 Wireless Router here, so I want to know if it comes with IOS and also where I can find a list of the IOS devices so I can know ...
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403
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DMZ-to-outside Access Lists
I'm learning about firewalls and access-lists, and I'm trying to decide what sort of access list I should have on the DMZ, particularly regarding outbound traffic. There's certain outbound traffic ...
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Cisco IOS: Is ip inspect used?
There is a Cisco IOS router with the following code in it. The below code seems to define Context-based Access Control Engine inspection rules. I don't think any of this is used.
The only occurences ...
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6
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Is there a way to submit a batch of commands to a Cisco router and have them execute from the router?
I need to change the configuration of a remote (6 hours' drive) client's Cisco 871 (IOS 12.4.15T) from my location because of some new internet service at his location. To be more precise, I need to ...
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Why would Windows Server not respond to DHCP DISCOVER?
My network was working just fine and I broke it.
There is a Cisco 1711 router which was configured to hand out DHCP leases to the client PCs. I have a domain controller (Server 2008) on the same ...
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2
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2
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Restoring a Cisco router config using a config file
I'm working with a Cisco router over telnet (actually PuTTY), and I'm a newbie to ios.
I'm slowly getting the hang of it, but have a very basic question:
I have issued a show running-config command ...
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