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1500 questions
7
votes
2 answers

ASR920 and output drops - surprisingly, IPTV seem to work okay

Maybe my question will be a bit unusual because I will not ask why something doesn't work. Instead, I will ask why things seem to work okay. I have ASR-920-24SZ-IM connected to upstream ASR9ks with 2x10G links. Downstream device is cisco 4948E…
mkurek
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7
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2 answers

What is the difference between "ip domain name" and "ip domain-name"?

I'm running a ISR 4221 with "Cisco IOS XE Software, Version 16.04.02". I see that it has both ip domain name and ip domain-name commands. Why? Is this some sort of compatibility thing? My 7206 seems to prefer ip domain-name. Just…
Erik Bennett
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2 answers

Manager states we cannot put retail switches on network due to fear of non-STP config and network storm problems. Is this true?

I'm a desktop support engineer working with a Cisco certified manager. I value her opinion greatly when it comes to networking issues. However, I'm split on this because with my knowledge of networking (granted not as much as hers) I don't see how…
Jason
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7
votes
2 answers

NAT Overlapping

I am trying to do some networking lab. Basically, I have a network like this: So, is it possible to configure NAT router in such way, that PC1 and PC2 can access remote HOST and each other. The problem for me is that PC1 and PC2 have same local ip…
mcferden
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7
votes
4 answers

How to make IPSEC over double NAT?

I need to have a site to site VPN between two sites. Here is the following topology for each site: Site A: One Cisco 1921 WAN port (192.168.3.2) connected to ISP router (192.168.3.66), both the Cisco 1921 and the ISP's router are doing NAT…
Moh'ed A-Nasir Dhagajuun
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7
votes
4 answers

What exactly is the difference between SDN & NFV?

What is the difference between SDN (Software Defined Networking) & NFV (Network Function Virtualization)? Wikipedia says NFV relies on standard client-server model. How is this model different than Data plane-Controller plane model? Please explain…
Nullpointer
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7
votes
3 answers

New VLAN across multiple Cisco switches

I have setup a new VLAN on my corporate network for use for guests only. I am trying to setup a guest WiFi service and keep all of the traffic separate from the business traffic. So far I have created a 172.16.0.0/24 subnet using VLAN 172 for…
Becky
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7
votes
3 answers

How does the ISP connect me to the Internet?

I know its a dummy question, but I couldn't find any information about it around the Internet. I know about modems and routers and how they work, but I don't get how the ISP connects me to the internet? I mean... How do ISP's communicate with…
user34853
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7
votes
4 answers

Building too large for ethernet runs

I'm pretty new to network design. I know enough to wire small buildings and such, but I'm puzzled as to how work this one out. A building I'm working on is an odd shape, and very large. Unfortunately, it is too large for standard cat5e. I certainly…
user34833
7
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2 answers

Devices that utilizes CISCO IOS Operating system

I am a bit confused about the CISCO IOS operating system. My final year research project is based on solving some security vulnerabilities that i dug up that exists in the CISCO IOS, thus i need to find a CISCO router to implement my solution. This…
Hasitha Shan
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7
votes
2 answers

Cisco ASA: Why does static NAT block access through VPN?

TL/DR I set up a static nat rule, so that I can use my public internet IP address to directly ssh into a dedicated machine on the inside network. As a result I cannot ssh into the dedicated machine anymore, when connected through AnyConnect VPN.…
user1129682
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7
votes
4 answers

iBGP AS path prepend propogation

I have following scenario: My AS: 64501 has two routers R3 (Redundand) and R4 (Main). ISP AS: 64500 has 3 routers R1, R2 and R5 I have eBGP peering with ISP, I have no access to ISP configuration, only to configuration on my net (R3, R4). I need…
DmitriiGangan
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7
votes
2 answers

What certifications are there for Fiber Optic termination and splicing?

As a knowledgeable person in computer networks I have always had an itch for learning how to create custom-length fiber optic cables. So, as a personal goal, I want to get trained and certified in cable termination and splicing. What is a good…
angelcool.net
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7
votes
2 answers

IPv6 and online privacy and security

I am studying up on IPv6 and part of the talk was about how the machines generate or can have multiple IPv6 addresses for internal use and external use. Does this mean that there is no longer a "public" IP address that all the machines inside a…
Jason
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7
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3 answers

"Bridge” two subnets together?

Here is what the network looks like: Network A is 192.168.116.X , subnet 255.255.255.0 Network B is 12.32.8.X , subnet 255.255.255.0 There are no routers present in either of the network schemes. All routing is done through unmanaged switches and…
Eminent
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