Most Popular
1500 questions
9
votes
4 answers
How does one specify certain IPs or MAC addresses for NBAR policy enforcement?
In an office environment, if I wanted to block youtube using a Cisco ISR router, I would set up the following with NBAR:
class-map match-all YOUTUBE
match protocol http host "*youtube.com*"
!
policy-map DROP_YOUTUBE
class YOUTUBE
…
lamp_scaler
- 655
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- 15
9
votes
2 answers
Configure External Interface for DHCPv6 client on Cisco IOS
What are the necessary steps to configure IOS 12.4(25f) to support IPv6? Comcast is the ISP, and I'll be using a Server 2012 box for internal DHCPv6.
I'll need to grab a DHCPv6 address from Comcast for the external interface.
So far, on my external…
user1569
9
votes
1 answer
Blocking IPv6 RA advertisements on Juniper EX series switch
How do I go about blocking IPv6 RA advertisements on access ports on a Juniper EX series switch? I know that Cisco offers ra-guard as an option much like bpdu-guard on spanning tree, I am just not sure how to accomplish the same thing in Junos.
YerPhate
- 111
- 4
9
votes
3 answers
Assign an IP address based on switch port
Short:
I want DHCP server to assign a preconfigured IP address based on a port (on a switch, ideally) a device is connected to.
Long:
My situation:
I am building an automated indoor farm (for growing tomatoes). The farm is composed of many (12 for…
THX-1138
- 193
- 1
- 1
- 4
9
votes
3 answers
AAA/TACACS+ password on Cisco switch always fails at second password prompt
Whenever logging into a network device using AAA/TACACS+, if I fat-finger the password prompt after the username prompt, the second password prompt always fails even when the password is correct. I have to wait for the username prompt again, and…
generalnetworkerror
- 7,104
- 6
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- 66
9
votes
3 answers
What type of fiber do I need for a WS-G5484
I have bought two WS-2948G switches from cisco for a lab. I now need to buy two additional modules for them WS-G5484. I've never worked with fiber so I was wondering if there are differences in fiber cables and what type of fiber cable I should use…
Lucas Kauffman
- 4,171
- 5
- 29
- 51
9
votes
2 answers
CDP not available to be enabled on ME3400 port
We have a ME3400 that we want to enable CDP on but there is no cdp option. Why is it not available?
switch(config)#int gi0/1
switch(config-if)#cdp ?
% Unrecognized command
CDP is enabled globally.
switch#show cdp
Global CDP information:
…
Adam Loveless
- 3,129
- 7
- 30
- 51
9
votes
2 answers
Brocade chassis and CDP
I know Brocade will gladly accept CDP from Cisco devices and display it in a show fdp neighbor.
If you enable CDP on a Brocade chassis will it send CDP packets out as well as FDP?
Adam Loveless
- 3,129
- 7
- 30
- 51
9
votes
2 answers
Finding the IP of a MAC Address
Is there a way to derive the IP of a device from their MAC address on a Cisco device?
Assume you are not on a local segment where ping sweeping / arp are possible, instead you are remote and there are many routers between you and the endpoint. …
A L
- 3,310
- 9
- 33
- 56
9
votes
5 answers
How can I find what optic is in an interface for a Juniper MX-series router?
As the title states, how can I see what optic I have installed in an interface for an MX router?
Wild Bill
- 401
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- 9
9
votes
2 answers
VRRP and VRRP-Extended
Is VRRP-E a completely separate standard than VRRP or does it just add on features to the VRRP standard? What are some major differences between VRRP and VRRP-E?
Adam Loveless
- 3,129
- 7
- 30
- 51
9
votes
5 answers
How to - use regex in Nexus to search for this | or that?
So aggravating - i can't find good documentation on how to use the Nexus regex command.
So, if my interfaces look like this:
interface Vlan224
description MANAGEMENT
no shutdown
ip flow monitor netflow-monitor input
no ip redirects
ip…
Pseudocyber
- 887
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- 15
9
votes
3 answers
Why do we use OSPF Point-to-Point Networks for Loopbacks?
Why do we use the ip ospf network point-to-point command on loopback interfaces?
interface Loopback0
ip address 2.2.2.2 255.255.255.0
ip ospf network point-to-point
kindly explain that..
Trojan
- 1,408
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9
votes
3 answers
EtherChannel and odd number of ports
Is the requirement of 2n number of ports for EtherChannel a critical requirement or just a recommendation to ensure, perhaps, an even load balancing?
Particularly, if we setup an EtherChannel group with 8 ports but one of them went down. Would the…
Weaam
- 193
- 1
- 7
9
votes
4 answers
How is a TCP connection maintained over a changing IP address
I remember when I connected to the internet via the phone line and a 56kbps modem, changing ISPs was as simple as changing the phone number dialled by the modem.
I remember that my IP address would change every 1 minute, without a break in…
Drahcir
- 193
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- 1
- 5