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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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Is my Cisco switch port bad?

I've been chasing a packet-loss and network stability issue for a handful of end-users on an internal network for the past few days... These issues surfaced last week, however the location was struck by lightning six weeks ago. I was seeing 5-10%…
ewwhite
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Cisco ASA and multiple VLANs

I currently manage 6 Cisco ASA devices (2 pairs of 5510s and 1 pair of 5550s). They all work quite nicely and are stable so this is more of a best-practice advice question rather then "OMG it's broken help me fix it". My network is split into…
bart613
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Cisco ASA Site-to-Site VPN Dropping

I have three sites, Toronto (1.1.1.1), Mississauga (2.2.2.2) and San Francisco (3.3.3.3). All three sites have ASA 5520. All the sites are connected together with two site-to-site VPN links between each other location. My issue is that the tunnel…
ScottAdair
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Cut network cables in Cisco 2960 PoE

We've a Cisco 2960e that services our VoIP phones and other things. I inherited it. The question I have is the cut cables: there are about four network connectors that are cut about 1cm away from the end - making it nothing more than a physical…
Mei
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Cisco and Linux and Vlans

I appear to have some fundamental misunderstanding of how VLANs work on Linux, and I'm hoping the good people here can educate me. Cast: One Cisco 3560, one VLAN, and one Linux box [1]. Cisco --------------- Linux ge0/1 eth0 The…
Darren H
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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 it? I know which firmware I want, and it's a minor…
Massimo
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How to configure Cisco VPNUI shortcut to open a specific host?

How do I configure the Cisco VPNUI client as a shortcut to open a specific host? As far as I can tell, the program doesn't take an command line arguments, or does it? The problem is that the VPNUI.exe doesn't remember a history of VPNs you have…
djangofan
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Cisco FWSM -> ASA upgrade broke our mail server

We send mail with unicode asian characters to our mail server on the other side of our WAN... immediately after upgrading from a FWSM running 2.3(2) to an ASA5550 running 8.2(5), we saw failures on mail jobs that contained unicode and other text…
Mike Pennington
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Authenticate Linux sshd with TACACS+ (Cisco ACS)

Our network engineering team uses multiple linux servers for syslog collection, configuration backups, tftp, etc... We want to use TACACS+ on a Cisco ACS machine as our central authentication server where we can change passwords and account for user…
Mike Pennington
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Why do modern routers not require clock settings anymore?

From my Cisco books (CCNA level) I learned that in a WAN connection one router must be configured as the DCE and the other as the DTE. In real life I have a DS-3 between two routers. There are no CSU\DSUs (just coax out) or DCE\DTE configuration…
user974896
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show all users on a Catalyst Cisco switch

I am new to Cisco, I am having some difficulty: I'd like to list all user accounts. show users only displays currently logged in users. I have no problem changing the enable password, but I'd like to see all available users so I can change specific…
TryTryAgain
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Can a Cisco 3550 be used as router?

Very recently I picked up a Cisco 3550 just to play around with networking and to familiarize myself with Cisco's command line configuration due to the fact that I will be working an electrical engineering internship in which I will have to deal…
kubiej21
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Is bonding mode=5 a solution against MAC flapping?

There is two are interconnected Cisco WS-2950T. By the one GBIC port on first switch connected a first NIC of bonding interface, and by the one GBIC port on second switch connected a second NIC of bonding interface. Of course the both switches sees…
jurijcz
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DMZ subnet: to NAT or not to NAT?

I'm looking at setting up a DMZ behind a Cisco ASA that will contain a large number of HTTP front-end load balancers and SSL offload services - over 100 IPs, concentrated on a smaller number of hosts. In the past I've kept all the hosts on RFC1918…
natacado
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New network design from a noob. VLANS, IP's, hardware, etc. Any comments please

I’m currently planning a large network infrastructure for a University in Ethiopia and would like people’s comments on my planning. Please bear in mind I have never done networking before. The campus covers 80 buildings including laboratories,…
Stokie Mike
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