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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 questions
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Split multicast traffic on two vlans using IOS

Here is what I want to do: On a switch / router running cisco IOS ( Ideally it would work on a Lanbase image on a 3560G but it is possible to use 65xx routers also ) I receive two udp multicast streams on vlan 100: vlan 100, @239.34.1.1:1234 and…
Olivier S
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Show code for specific block in cisco IOS conf mode?

I work with Fortigate gear a lot and in the CLI it's possible to navigate to a node (say config system global then type in show and it will show me the configuration from that block. In IOS I can't figure out how to do this, I know I can exit conf…
Myles Gray
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Dual Cisco Router Stateful Firewall

At my company we have a single Cisco 3925sec/k9 router running BGP with 2 ISPs. Now we want to purchase a redundant router of the same model to eliminate a single point of failure. I can set up BGP between routers and ISPs no problems. We plan to…
Alec T
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strongSwan without password on iOS

I have the following problem: I need to authenticate on VPN with iOS without password, but with certificate only. The reason is I need "VPN on demand", which is active on certificate authentication only. I found this tutorial, but it uses…
Alex Petrov
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What is the Cisco iOS (CLI) command to display a WAP's Radio MAC address?

I can't believe I'm unable to find this with teh g00glez or by RTFMing, but does anyone know how to display the MAC address of a Cisco WAP's Radio (wifi connection) from the command line? show version is nice enough to tell me that I have 2 Radios,…
HopelessN00b
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Can a Private VLAN trunk also trunk normal VLANS

Imagine a topology with Switch A and Switch B trunked together. Also imagine a router on a stick attached to Switch A that routes for these VLANs. The VLANs are as follows: VLAN 1 = 10.1.1.0/24 VLAN 2 = 10.1.2.0/24 VLAN 3 = 10.1.3.0/24 …
user974896
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Configuring a loopback interface on a Cisco router

I have Router 1 with the following interfaces: FA0/1: 192.168.9.193 255.255.255.224 S0/0/0: 192.168.9.129 255.255.255.224 S0/0/1: 192.168.9.161 255.255.255.224 This is for my assignment at university, there should be a computer connected to the…
Jack Brown
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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 12.2.58-SE2(ED) and 15.0.1-SE2(ED) Do I need to remain…
jeremy
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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 other settings configured as I want them, but I…
Mike Insch
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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 just messed up: ny-swstack01#show int…
Kyle Brandt
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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 nifty little network emulator program). In my…
JCCyC
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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 regarding flash and nvram. The terms are sometimes used…
mitch
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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 memory slots. What I do not know is whether the…
atroon
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Monitoring incoming/outgoing packets on a Cisco switch

I would like to monitor (i.e. have the switch print out packets) incoming and/or outgoing packets on a Cisco switchport. For instance, I'd like to be able to tell it: Print to the log all packets arriving on Gi0/1. Something tells me this should be…
MikeyB
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Cisco IOS: NAT overload for two WAN interfaces

I have a feeling the answer is policy-routing, but I'd like someone to clarify that. Basically I'm not having any luck getting NAT to work with two WAN interfaces. I have two WAN interfaces: fe0/1 (static, 200.200.200.2/30, gw 200.200.200.1/30) and…
WuckaChucka
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