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.
2,633
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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 ...
- 1,466
21
votes
2
answers
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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 ...
- 5,373
20
votes
5
answers
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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 ...
- 2,401
19
votes
5
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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 ...
- 339
17
votes
5
answers
2k
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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 ...
- 1,351
16
votes
5
answers
3k
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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 ...
- 246
15
votes
2
answers
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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 ...
- 3,933
14
votes
6
answers
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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 ...
- 351
13
votes
10
answers
5k
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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. ...
- 10.6k
13
votes
10
answers
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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 ...
- 522
13
votes
1
answer
6k
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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 ...
- 295
12
votes
2
answers
3k
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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 ...
- 223
11
votes
8
answers
29k
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Blocking Facebook and Myspace by IP address
I'm having some trouble making a Cisco ASA device block certain social networking sites which have become time sinks in our office. This question is really in two parts:
Is there a reliable way to ...
- 803
11
votes
4
answers
3k
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How to find what is wearing out my SSDs
We have 8 Cisco servers with 12 spinning disks for data and 2 SSDs for OS. The 2 SSDs are in linux software raid 1. The SSDs all have their wear indicator in single digits and some of those that have ...
- 509
11
votes
2
answers
6k
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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 ...
- 2,460
11
votes
3
answers
2k
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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 ...
- 844
11
votes
6
answers
2k
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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- ...
- 299
10
votes
3
answers
7k
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Connect to switch's console port through ethernet patch panel
In our office building, we have a Cisco SRW2048 switch. On the back, it has a serial port for console connections. I would like to connect this console port to my computer in my room.
The switch is ...
- 211
10
votes
3
answers
35k
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How do I reach my internal server on the external IP?
We are trying to configure our Cisco 5505, and it has been done through ASDM.
There is one big problem that we're not able to solve, and that's when you go from inside to outside and back in again.
...
- 213
10
votes
3
answers
18k
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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:...
- 1,786
10
votes
7
answers
4k
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Are VLANs necessary for my environment?
I'm the new network manager for a school. I've inherited an environment made up of several Windows servers, about 100 Windows clients, 10 printers, 1 Cisco router, 6 Cisco switches, and 1 HP switch. ...
- 359
10
votes
2
answers
2k
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How to safely install a new IOS image on a Cisco device when the installed flash memory size isn't enough for two of them?
Today I was updating IOS on a Cisco 877 router, and a problem came up: the installed flash memory wasn't enough to hold both the old and the new IOS images, so the new one couldn't be uploaded unless ...
- 71.7k
10
votes
5
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Spanning Tree Setup
I understand the basics of spanning tree, but that's about it. I'm hoping that someone can tell me if this will work as I want it to.
I've got two Cisco ACE load balancers setup for redundancy. ...
- 27.2k
10
votes
3
answers
11k
views
Native VLAN mismatch and missing VLAN?
I'm trying to wrap my head around what exactly is going on here with a new site's configuration of their networking stack. This particular piece I am working is pretty simple but I having a hard time ...
user62491
10
votes
2
answers
6k
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Smart card authentication to a Cisco switch?
We have our Cisco network devices configured to authenticate network administrators using their domain accounts via RADIUS running on a Windows 2008R2 server with the network protection role. This ...
- 2,948
9
votes
4
answers
47k
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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....
- 4,220
9
votes
3
answers
24k
views
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 ...
- 71.7k
9
votes
1
answer
3k
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What happens in the real world Internet - BGP and OSPF?
I have never worked on the customer premises, but my assumption is that one service provider runs IGP services internally - For example - OSPF or IS-IS.
Now, when one service provider has to reach ...
- 225
9
votes
2
answers
16k
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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 ...
- 199k
9
votes
2
answers
15k
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HP to Cisco spanning tree root flapping
Per a recent question I recently configured both my HP (2x 2900) and Cisco (1x 3750) hardware to use MSTP for interoperability. I thought this was functional until I applied the change to the third ...
- 15.6k
9
votes
1
answer
1k
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Cisco BGP Unequal Cost Load Balancing
I'm trying to implement BGP Unequal Cost Load Balancing feature in my network.
According to cisco manuals (long: http://www.cisco.com/c/en/us/td/docs/ios/12_2s/feature/guide/fsbgplb.html, short: https:...
- 194
9
votes
3
answers
8k
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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 -----...
- 91
9
votes
1
answer
4k
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Ubiquiti Wireless Guest Network VLAN w/ pfSense + Cisco Switch
I'm trying to setup a guest wireless network in an environment that has been humming along nicely for quite some time. The wireless runs on Ubiquiti UniFi APs.
I hope this is clear. If its not, feel ...
- 3,469
9
votes
3
answers
882
views
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 ...
- 548
9
votes
1
answer
9k
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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 ...
- 141
9
votes
1
answer
17k
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How to export Cisco AnyConnect preferences and certificates to another PC
I have two computers (PC and MAC) connected to different organization VPNs. I want to be able to connect from MAC to the same VPNs set on PC. So I need to export VPN list and certificates, etc to my ...
- 191
9
votes
2
answers
697
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Cisco DNS doctoring or Hairpinning?
I've the following configuration: CISCO 881, IOS 15.2(4)M6. On WAN interface is configured the 86.34.156.48/29 subnet from our ISP. Behind the router is staying 2 webserver. NAT: 86.34.156.51 <> ...
8
votes
3
answers
812
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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 ...
- 4,590
8
votes
1
answer
2k
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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 ...
- 341
8
votes
2
answers
5k
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pfSense Firewall or Linksys/Cisco router for small offices
I'm about to start switching some networks around for multiple small offices. Each office has about 10 to 15 users and 10 to 15 computers. Each office has a spread of generic routers and access points....
- 663
8
votes
3
answers
105k
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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 ...
- 1,162
8
votes
2
answers
5k
views
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.
...
- 3,397
8
votes
6
answers
820
views
Cisco router for educational purposes
I want to buy a Cisco router to use on my home network. I'm just hoping to get a unit that is not too old and is not a SOHO model.
I want to run the latest Cisco OS just to learn how Cisco does ...
- 950
8
votes
1
answer
35k
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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 ...
- 8,379
8
votes
1
answer
9k
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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 ...
- 207
8
votes
1
answer
2k
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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 ...
- 8,379
7
votes
4
answers
6k
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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 ...
- 279
7
votes
4
answers
4k
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Is Selling Old Cisco Routers a Security Issue?
I'm a system admin but I'm not Cisco certified and I'm not a network engineer. Basically I only use switches/routers/modems with a GUI.
I've inherited a pile of old Cisco routers that are not in use ...
- 771
7
votes
4
answers
2k
views
Cisco IOS QoS prioritize SSH but not SCP
How can I prioritize ssh traffic to ensure low-latency but throttle SCP file transfers? I'm looking for a solution that is not host specific so I don't have to add lists of IP addresses. Thanks!
- 2,242
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