Server Fault Stack Exchange
Server Fault Stack Exchange

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:

, , , , ,

2614 questions
47
votes
16 answers

64-bit Cisco VPN client (IPsec)?

Cisco VPN client (IPsec) does not support 64bit Windows. Worse, Cisco does not even plan to release a 64-bit version, instead they say that "For x64 (64-bit) Windows support, you must utilize Cisco's next-generation Cisco AnyConnect VPN…
mika
  • 1,466
  • 2
  • 12
  • 18
20
votes
5 answers

ARP broadcast flooding network and high cpu usage

Hoping someone here might have some insight to the issue we are facing. Currently we have Cisco TAC looking at the case but they are struggling to find the root cause. Although the title mentions ARP broadcast and high CPU usage, we are unsure if…
Cold T
  • 2,391
  • 2
  • 16
  • 28
20
votes
2 answers

Cisco AnyConnect SSL VPN client allows local LAN access, but not on additional multi-homed server

We have a machine for connecting via Cisco SSL VPN (\\speeder). i can ping our our speeder on 10.0.0.3: The routing table on \\speeder shows the multiple IP addresses we have assigned to it: After connecting with the Cisco AnyConnect VPN…
Ian Boyd
  • 5,131
  • 14
  • 57
  • 79
18
votes
5 answers

Cisco Anyconnect: Vpn establishment capability from a remote desktop is disabled

I need to run Cisco AnnyConnect from a VM in a data center. When I run it I get this message: Vpn establishment capability from a remote desktop is disabled Can this be turned off? I saw some posts about it, but required downloading Cisco software…
Daniel Williams
  • 329
  • 1
  • 2
  • 13
17
votes
5 answers

IPv6: How to start? (ISP perspective)

In our company we have a range of /21 (2048) IPv4 public addresses. We have a bunch of Cisco routers and servers. How to get started with IPv6? What can we do to provide internet to our clients with IPv6 compliment as well?
Andre
  • 1,333
  • 4
  • 18
  • 31
16
votes
5 answers

Are Cisco admins expected to understand classful networks?

While studying for the CCENT exam, my reference materials have made an alarming number of references to class A/B/C networks. Thankfully they just treat Class A/B/C as shorthand for /8, /16, and /24 CIDR subnets, and don't make any mention of an…
YouAreTheHat
  • 246
  • 1
  • 3
  • 8
15
votes
2 answers

What is this item that came with my Cisco switch?

We just received a new Cisco Catalyst 2960, and in the box came an item we've never seen before. Interestingly enough, the documentation shows an image of the object, but it is not listed anywhere else in the guide (including the legend, which is…
newmanth
  • 3,913
  • 4
  • 25
  • 46
14
votes
6 answers

Code to generate Cisco "secret" password hashes?

Does anyone have a pointer to code (or just the algorithm) that Cisco uses to generate their password hashes for things like "enable secret"? I'm not trying to break into anything; I'm trying to generate the appropriate "enable secret" line given…
Brent Chapman
  • 351
  • 1
  • 2
  • 8
13
votes
1 answer

Do I really need a DB9-RJ45 adapter to connect to a Cisco router console, and if so, why?

I have an Enterprise grade Cisco router and an HP laptop. I would like to connect to the router on the console port to conduct out-of-band management. The console port on the router uses an RJ45 terminal. I have one on my laptop as well. My…
Hack-R
  • 295
  • 3
  • 12
13
votes
10 answers

Identify machines connected to switch

Our company recently closed down half our office space, which was not being used. We gave back the unused space to the building management and had it walled off. Prior to us closing it off, I jotted down the network jack #'s on the side to be closed…
Citizen Chin
  • 532
  • 1
  • 12
  • 21
13
votes
10 answers

Why buy high end hardware firewalls?

There exist firewalls from Juniper and Cisco that cost more than a house. So I wonder: what does one get from a $10.000+ firewall compared to an 2U server with 4x 10Gbit network cards running e.g. OpenBSD/FreeBSD/Linux? The hardware firewalls…
Sandra
  • 9,973
  • 37
  • 104
  • 160
12
votes
2 answers

What's the protocol-level difference between IPSec and "Cisco IPSec"?

Most VPN clients distinguish between IPSec and "Cisco IPSec." For example, (Apple's) iOS treats them as essentially separate things. But I can't find any explanation of what the protocol-level differences are. They may be minor, but there definitely…
Dave Peck
  • 223
  • 1
  • 6
11
votes
6 answers

What is the best solution for traffic control in a large system (ca. 2000 users)?

following situation: We're a group of students administering the internet connection for the local resident halls, with a total of about 2000 end users. We have a traffic point system, every MB down- or upload costs points, new points are added by…
Christoph Wurm
  • 299
  • 2
  • 12
11
votes
3 answers

How come one of my switches is off by two minutes in spite of ntp?

I just noticed by pure chance that one of my Cisco 4500 switches has its clock going wrong: it is more than 2 minutes behind in spite of seemingly functional ntp. In my opinion, even a single second should not be considered acceptable for the…
Hagen von Eitzen
  • 816
  • 3
  • 15
  • 41
11
votes
2 answers

Cisco Catalyst 2960 Switches - Can I reverse the air flow?

I have some equipment that will be moved to a new datacenter soon. At the current datacenter, the switches are mounted in the back of the racks so the air flow for the switches is reverse in comparison to the rest of the equipment on the…
Cha0s
  • 2,432
  • 2
  • 15
  • 26
1
2 3
…
99 100