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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:

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Cisco: some NAT and firewall rules do not load after reboot

I am relatively new to Cisco routers but managed to configure most of the stuff successfully. However, there is one problem that I just can't find a solution to. I have set up a VDSL connection on Dialer0 interface and configured some basic…
Eliazar
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Cisco spanning tree configuration

I need your support for my spanning tree configuration. I like to bridge my public network to a server and give him a public IP. I am using a virtual wire at the firewall to forward the public network. Later I connect the server to the vlan 123. I…
Timo
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DNS "recursion not available" using a Cisco AnyConnect VPN connection

Does anyone have experience with configuring Cisco AnyConnect VPN? We have a problem with client DNS name resolution when connected over VPN. To me, it looks as if the Cisco AnyConnect VPN client intercepts DNS queries from the clients. Can…
codeape
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Unable to SSH to Cisco Router

SSHing to my Cisco Router ends up hanging indefinitely. When attempting to ssh -vvv from Ubuntu to my Cisco router (IOS 15.8) with the SSH command, It says Connection established.. While directly connected to the router via console, I can…
catatonicdog
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Equipment required for AWS outpost

Have anybody configured network equipment for AWS outpost? The demarcation point is the patch pannel in AWS rack. Requirment is to configure equipment back from the rack to internet. The rack will be put in DC. Based on documentation I found on…
patrykk
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Why are Cisco access-lists bound to a specific interface?

This might seem like a simple/dumb question, but for me it is not. Please bear in mind, that I'm not a network administrator, so it's not obvious to me. Anyways, straight to the point: Why do I need to bind ACL to specific interface ? In other…
zbro
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Cisco multicast configuration

I'm on an isolated (for now) catalyst 3560e. I have a multicast source, which when enabled, causes flooding to all switch interfaces. I have a second different multicast source, which does not cause flooding, it only gets delivered to the sinks who…
Dustin Getz
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Unifi specific SFP adapters?

I have a few 10GbE SFP+ devices with Cisco plugs. I need to upgrade my network and am considering a switch from Unifi. Does anyone know if they play well with SFP+ plugs from other brands? Thanks!
kareldc
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Can't get connection over fiber run

Between two server rooms on an office campus I have three pairs of fiber with an interconnect panel in the middle. Two of the three pairs were connected before I started here and are working. I cannot get a connection over the last pair for the…
NaOH
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Computer getting Unable to Identify Network UNLESS Vlan is changed

Question moved from Network Engineering to Server Fault. This is a problem that has long plagued this environment. At seemingly random times (measured generally in months), a computer may suddenly lose connectivity to the network. It still is able…
zzz
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finger service not getting enabled in my router(cisco packet tracer)

i tried enabling 'ip finger' command in my router, but it isnt' working, someone please help Router#config terminal Enter configuration commands, one per line. End with CNTL/Z. Router(config)#ip finger ^ % Invalid input detected…
swetha reddy
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'arp authorized' alternative

Is there another way besides arp authorized command on a cisco router to prevent users from setting static IP addresses on their computers and getting access to the network? Essentially, limiting access to the network through a valid DHCP server.
jinanwow
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Is The Cisco AnyConnect licenses shariable between two low-end ASAs?

I have two low-end Cisco ASA 5506-X with bundled Security Plus licenses. These ASAs are just for remote dial-in VPN access for our staff. Now all users using IKEv2 and IPSec/L2TP (IKEv1) connection methods but IPSec works unstable sometimes under…
Vadim Rybalko
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Cisco ISR4431 router randomly reboots

I have a Cisco ISR4431 acting internet edge router that has been randomly rebooting every 5 days or so. When it reboots it takes anywhere from 10-60 minutes before it is back up and network traffic is flowing normally. It is running BGP and…
John P
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How do you configure access lists to restrict inbound ports while allowing all outbound traffic on a Cisco 2911 router with NAT?

First caveat: I did not design this network. Most of my recent networking experience is with ASAs; configuring NAT & ACLs there is pretty easy and straightforward. In this case, the engineer who installed the 2911 chose it because, in his words, the…
Thomas
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