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1500 questions
6
votes
3 answers

Mount a 2U router on a wall

I have been unable to find any information or specific mounting brackets to fasten a Cisco 3825 2RU router to a wall, so I am wondering if anyone here has experience with this. I have the regular rack mount brackets, but unlike other model routers,…
WaxTrax
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6
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1 answer

Is it possible to have ranges in two octets in an ACL / object-group

I'm trying to find out if there is a "clean" way to do this. I need to setup a ACL on a FWSM that effects devices over multiple subnets. The structure looks like this: 10.10.1-254.1-15 I could do: object-group network example network-object…
evolvd
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1 answer

What is a FEC in MPLS domain?

Does FEC correspond to a Next-hop ipaddress or Destination Ipaddress or a combination of Next-hop/Destination Ipaddress and QOS values ?
Hemanth
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6
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1 answer

Is it possible to run an IPv6 only MPLS core?

I am looking for information on whether it is actually possible to run an IPv6 only MPLS Core with respect to the transport labels, without the current requirement to tunnel across IPv4. To put this into perspective, I am running a dual stack…
DrBru
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6
votes
2 answers

how to find the right value of MTU Jumbo frame

we take the decision to set jumbo frame on all our linux machines we have hadoop cluster with master machines , workers machines and kafka machines our switches ( Cisco ) are suitable to Jumbo frame and that fine but jumbo frame can set as 8000 or…
yael
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6
votes
2 answers

What are the correct protocol versions (v4 vs v6) for packets inside DS-Lite tunnels?

I work for a company that develops Deep Packet Inspection tools. One of our customers, big ISP who has a large number of DS-Lite connected subscribers, was using our DPI engine to collect statistics on IPv4 and IPv6 usage in their network. It was…
Piotr S.
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6
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2 answers

What MAC address do I use to generate a IPv6 Pseudo-Random Global ID

I am setting up a virtual lab environment in the cloud to experiment with IPv6 networks. Bear with me please, I'm new to networking and my grasp of the whole IPv6 subject is quite shaky. Please correct me if I misunderstand any of the IPv6 concepts…
snrrn
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6
votes
3 answers

Does a switch always get a MAC address from a PC?

I was wondering if there is a possibility that a switch won't get the needed MAC address to it's CAM. For example, if the used protocol is UDP, where the sender doesn't need an answer back from the receiver? Thank you
Lukáš Stacke
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6
votes
1 answer

A FEX port remains inactive - how can I bring it up?

When implementing Cisco Nexus 5k switches (5596UP), I connected a server to a dual homed 2000 FEX (2232T), the port belonging to a virtual port channel. However, the port changed the status from notconnected to inactive and remained so. I verified…
Stefan
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6
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4 answers

Why are static IP addresses considered a bad practice?

Im looking to better understand this piece of advice in relation to setting up devices on internal networks with static IP addresses, and why that is considered a bad idea. On the surface of it, setting up static IP addresses for devices on an…
BruceJohnJennerLawso
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6
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1 answer

What's use of Port Isolation vs traditional VLANs?

I've seen several switch products advertising port isolation feature as "way to limit ports communication without configuring VLANs" and it sounds quite... sketchy? If i understand it correctly port isolation allows you to literally specify which…
Lapsio
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6
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1 answer

How do you configure a TACACS+ tac_plus server on Ubuntu 16.04 that authenticates against Microsoft Active Directory?

How do you configure a TACACS+ tac_plus server on Ubuntu 16.04 that authenticates against Microsoft Active Directory?
dt1235
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6
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1 answer

Calculate the FCS number from a frame ethernet

I've the following frame ethernet: 08 00 20 0A 70 66 08 00 20 0A AC 96 08 00 45 00 00 28 A6 F5 00 00 1A 06 75 94 C0 5D 02 01 84 E3 3D 05 00 15 0F 87 9C CB 7E 01 27 E3 EA 01 50 12 10 00 DF 3D 00 00 20 20 20 20 20 20 9B 52 46 43 Where 0x9B524643 is…
Davide
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6
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3 answers

Lab: I need to determine information about a device on a specific port of a Cisco multilayer switch

I have a Cisco Catalyst that has a port that is up up, and the device does not show in the ARP table. The MAC address-table shows a MAC address for the port. What can I do from that switch to find out what the device is?
Kendrick
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6
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1 answer

The use of DMZ and single firewall design

Apologies in advance if this is a stupid question. I have just started exploring network designs and firewalls. I have come across a network design where there is single firewall between internet, DMZ and the internal network. From my…
DefenderAtkins
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