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Questions tagged [cisco]

Cisco is a provider of switches and routers to commercial consumers. Cisco devices run IOS or NX-OS operating systems. This is a generic tag to be used when no more specific tags are available. See the partial list of tags in the full Tag Wiki.

Cisco is a provider of switches and routers to many medium and large companies. Cisco devices often run IOS or NX-OS operating systems.

Since Cisco acquisition of Linksys, the consumer line of switches, firewalls and routers (which do NOT run IOS) have been rebranded under the Cisco name.

This tag is a generic tag - Wherever possible a more specific tag related to the product you are using should be used instead. For example:

, , , , ,

2629 questions
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List of Cisco ASA pre-defined services

Where/How can I get a list of all the services that are pre-defined on a Cisco ASA device? For example, I can do the following in a config: object-group service ALLOWTOSERVER service-object tcp www service-object tcp https And the ASA will know…
DrStalker
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Can I make a site-to-site VPN with a public IP on one side only?

I purchased two Cisco RV110W routers to create a site-to-site VPN between two offices. At the main office we have a static IP connected directly to the RV110W. The other office is an executive suite, so our internet is provided by the people who…
just.another.programmer
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Is enabling https on a Cisco router a considerable security risk?

I would like to use Cisco's Network Assistant to manage my Cisco routers (I know there are other solutions for this, but for now I've decided to use CNA). It requires the HTTP or HTTPS service to be running on routers being managed. Where I work I…
red888
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Can I use Cisco ASA's "NetFlow Security Event Logging" (NetFlow 9) for bandwidth monitoring

Cisco has introduced NetFlow 9 export in the latest software version for ASA firewalls. But it seems to be meant for event logging of security events only (as a replacement for syslog messages). But can it still be used for bandwidth monitoring,…
networker1
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Can I tail the log on a Cisco Router?

Can I tail the log on a Cisco Router? I have 'logging buffered 51200' and a debug running. I can see the packets with 'show log'. Can I tail this?
Kyle Brandt
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Cisco Firewall vs Cisco Router ACLs

What are the advantages of getting a dedicated firewall instead of, or in addition to, using ACLs and ip inspection on a router? I realize this might depend on the version of the router, are certain router versions basically a firewall and a router…
Kyle Brandt
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error "illegal software format" in upgrade fw .ros file of Cisco Sg200-26 small business smart switch

I own 2 cisco switches small business switches. they are both SG200-26 26-port gigabit smart switches. One has fw ver. 1.0.0.19 , while the other has version 1.1.1.8. I am now trying to upgrade their firmware to the latest version 1.4.0.88, found…
nass
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What could cause TFTP reloaded Cisco `running-config` on 871 to fail?

Cisco CCP Write Configuration borked my 871w config while I was trying to setup port forwarding. I went through the basic steps to reconfig the router. I looked to see if I could just reset the router. Nope. I tested the 871's flash memory with fsck…
xtian
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What does 'Si' mean with respect to network switches?

I am seeing references to Multilayer Switches with Si as in the network symbol below. What does the 'with Si' qualifier mean?
andand
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Does Cisco IOS support the use of variables in its configuration?

I'm configuring a Cisco IOS (version 15) router, and I need to use the same values in multiple places; in this case, I need to configure the router's name servers (ip name-server
) and also reference them in an ACL, as per this question…
Massimo
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What software should I use for IP tunneling

I have two ethernet networks which are connected by a router (think it is cisco). Trafic from the two networks must not be mixed. Except from one virtual server (Win2003 based on HyperV) on one LAN which is supposed to see two netcards one from the…
user18431
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1 answer

Should IGMP Snooping be configured on all Layer 2 switches on LAN?

We've used Multicasting for the first time in one of our applications and whilst I have got it working, I'd really like to fully understand how it works and what's going on behind the scenes. In an attempt to do this, I've run Wireshark on my PC to…
Matty Brown
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UCS FC Adapter Aborts

So here's the scenario, and I'm hoping @Chopper3 can chime in here. For our SAN fabric, we have a pair of Cisco MDS 9513 FC switches with three EMC frames and four Cisco UCS domains directly attached. The behavior we are seeing is that the CNA's on…
SpacemanSpiff
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How to fix an aborted firmware upgrade on Cisco SLM2048

There is a Cisco SLM2048 switch and the last firmware upgrade aborted, now the switch doesn't work anymore. I can't access the switch. The only evidence is a blinking system LED. As the switch doesn't have a serial console, is there a way of fixing…
kockiren
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How do I send traffic to specific IP addresses through VPN and others directly to the internet?

I am running Windows 7 and using the Cisco VPN adapter to connect to a private network where I access resources starting with the IP address 172.. My problem is that when connected to the VPN all external traffic is routed through the VPN. I want to…
keithwarren7
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