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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 208v output likely to cause issues in a Cisco switchbwith PSU rated for 220-240v input?

I’m a net/sysadmin. I had a Cisco switch chassis (4510) with 6000W PSUs go down due to both PSU faulting. Each PSU has one connection each to facility power and an APC UPS outputting 208v. The switch’s logs are uninformative except for a few power…
pants_towel
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Intel x550 not negotiating to 10Gb

We have a machine with an Intel x550 and a Cisco Nexus N9K-C9372-PX-E. For whatever reason, it will only negotiate at 1Gb, even though it is 10Gb capable and is being plugged into a 10Gb switch. This is on an Asus x299 10Gb board. We have about 15…
Kevin Vasko
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How does a client choose between two DHCP servers in the same network?

I read on netacad that there may be more than one DHCP servers in the same network and I was wondering, how does the client choose between them? Does the client choose the one that sends the DHCPOFFER first or there is something else?
lor
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Linux bond mode 802.3ad not activated

on a server running Debian Stretch I configured a bond0 with the 802.3ad mode as following: auto bond0 iface bond0 inet manual slaves eth0 eth2 bond_miimon 100 bond_mode 802.3ad The bond0 interface is up and and running but…
Mat
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Site-to-Site Tunnel between Cisco Router and Windows Server 2003/2008

Has anybody successfully created an IPSec site-to-site tunnel between a Windows Server 2003 or 2008 and a Cisco router? We tried the steps outlined…
Dejan Jelovic
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Can't backup Cisco configuration with tftp

I get the following error: SW-AL710-1#copy running-config tftp: Address or name of remote host []? 10.0.1.130 Destination filename [sw-al710-1-confg]? %Error opening tftp://10.0.1.130/sw-al710-1-confg (Timed out) This is my configuration: more…
Mishgun
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The right vpn to replace heavy ssh usage

We are a small development firm looking to access the following services remotely: http smb network shares rdc / vnc Currently we do this with a lot of ssh tunnels. We are looking into switching to a vpn solution, which hopefully should have less…
Sindhudweep
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Cisco 2811 manual/commands

I've got a small problem regarding a 2811 Cisco router. First of all, I can't a full manual. I found a couple of support pages on the Cisco webpage which is not bad, but I get redirects everywhere. (Like I click here, please go here and here and…
Apache
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Operating Temperature of Cisco routers

I am managing a small server room containing different pieces of networking equipment e.g. cisco3900, paloalto appliance, pc routers, various switches. The issue is that our server room has been operating without an air-conditioning unit for a long…
ultrajohn
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Linux ssh client log all commands

I'm going to setup a Linux console box for login to Cisco devices via ssh only from that Linux machine. How I can setup ssh client on Linux to log all commands applied to Cisco devices?
perun_
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Free (as in beer) Cisco VPN equivalent for Linux client

I have several customers that I connect to via Cisco VPN Client (v5 if that matters) on Windows. I'm doing some tidying up and was wondering if there was a simple way to be able to connect to the same vpn endpoints from a Linux desktop. It is our…
LRE
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Strongswan to Cisco ASA

I have a problem with connection two nets with IPsec. On the one side is Cisco ASA 55xx on the other TP-Link router with Debian 8.3 with StrongSwan behind the NAT. The problem also that I have somehow to NETMAP/SNAT network on the TP-Link side. But…
F M
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Unknown root user on Cisco 1921 router

Just a moment ago I ran the who command on my router and I noticed myself logged in on vty 1 but another user root was on vty 0. The Location under that user is some location I do not know (someone from klayer.com). But the strange thing is that I…
ojs
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Possible Cisco Router Hack?

We have a Cisco EPC3928AD EuroDocsis 3.0 2-PORT Voice Gateway from our ISP. The router is connected to a firewall (an Ubuntu-box running iptables and Wireshark). Our LAN (10.0.0.1/24) is beyond the firewall. No other equipment is connected to the…
ElToro1966
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Public IPs on MPLS Traceroute

When running a traceroute, should I see any public IP addresses when tracing route from one MPLS point to another MPLS point? So when I do a traceroute from 10.0.0.1 to 10.0.1.1, I see some public IP address in between... On some of the routers I…
Kyle Brandt
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