Network Engineering Stack Exchange
Network Engineering Stack Exchange

Most Popular

more tags
1500 questions
6
votes
2 answers

Why can I ping IP addresses from 127.0.0.1 to 127.255.255.254?

I thought that the loopback IP address of my machine is 127.0.0.1. I do not understand why am I able to ping IP addresses until 127.255.255.254.
yoyo_fun
  • 1,501
  • 4
  • 17
  • 27
6
votes
1 answer

Hp Procurve Action ignored in download mode

From an tftp server I'm trying to import the config to startup-config using copy tftp startup-config 10.0.0.10 5006zl.cnf The switch asks for confirmation y/n and when pressing y it just aborts saying that the config could not be loaded. show…
Valentin Bajrami
  • 193
  • 6
6
votes
2 answers

What is the difference between L2TP vs GRE

Can anyone clearly explain that what is the difference between L2TP and GRE tunnel? Is L2TPv3 Any different I am trying to understand where these protocol are used and why we use L2TP instead of GRE in some cases and vice versa. Thanks
Terminator
  • 445
  • 1
  • 6
  • 16
6
votes
1 answer

Cisco 2690x-Flex stack not working

I have 2 identical Cisco 2690x with flex stack plus modules installed in both. I have provisioned the first and it is up and running. When I add the second to the flex stack module and turn it on, it powers up and the flex stack indicator is green,…
Chris Kooken
  • 163
  • 6
6
votes
3 answers

Network Tunneling - why do we need it?

I have researched the topic of Network Tunnel but the information on this is rather confusing and inconsistent. So could someone please explain: In general, What is tunneling? Is it simply an act of encapsulating a packet with another header and…
user34639
  • 313
  • 3
  • 5
6
votes
1 answer

Router Ethernet port ip no accessible from clients

I have this setup with a hybrid of equipment's from Cisco and Ubiquiti Edge routers and Vyos. My Cisco Nexus configured with HSRP with all the SVI's on 192.168.1.243 as the active on HSRP and SVI's all on area 0.0.0.0 with SVI interfaces on…
Usaia Tawakevou
  • 86
  • 3
6
votes
4 answers

Ping a private IP address in another network

We all know that PCs on a LAN use private IP addresses such as 192.168.2.3, etc. Now my question is, how can a PC say mine having a private address of 192.168.2.3 communicate with other LAN PC having a private address of say 192.168.2.5 because not…
RRHS
  • 395
  • 1
  • 3
  • 14
6
votes
2 answers

Fortigate 100D internet on VLAN wan port

I am fairly new towards Fortigate firewalls and I am trying to set up one FortiGate 100D running firmware v5.0 as a router for a hotel network. I have 2 ISPs using PPPoE connection that runs on VLAN 500. I created VLANs for both wan1 and wan2…
Kenny Yap
  • 61
  • 1
  • 3
6
votes
1 answer

Why does source port and destination port differ, in my network communications?

I just knew by theory how two host communicate through a port and a protocol, and i always thought that they must be using the same port number aat both ends to communicate, but looking at the network traffic(using iftop on unix) on my computer…
Xsmael
  • 163
  • 1
  • 1
  • 5
6
votes
3 answers

MPLS traffic engineering

While studying MPLS I couldn't understand it's one basic functionality. Mpls creates tunnel interfaces or pseudowires between label edge routers. To achieve traffic engineering I can set different limits on different tunnels. But what decides which…
john
  • 1,237
  • 3
  • 12
  • 20
6
votes
2 answers

Full Duplex and Collision Domain

I have a very basic query on Collision Domain and Full Duplex Mode. There are two types of logical topology: Ethernet and Token Ring . Whenever we read about Ethernet the first thing that we are taught is CSMA/CD. It says that in Ethernet two…
Pratyush
  • 141
  • 2
  • 5
6
votes
1 answer

Why doesnt Bluetooth Low Energy interfere with Wifi

so the BLE advertising channels are located at 2402Mhz, 2426Mhz and 2480Mhz. That is so it does not interfere with the 3 wifi channels in the 2.4Ghz band. My question is especially about the 2426Mhz advertising channel. Wifi channel 6 ranges from…
User Name
  • 61
  • 1
  • 2
6
votes
1 answer

Responsibility of the physical sublayers of Ethernet

I'm learning about Ethernet and the sources I've found seem to be controversial regarding the role of the physical sublayers of Ethernet displayed on the following image. Just to mention an example for that: the…
francesco
  • 61
  • 2
6
votes
2 answers

How to properly name TIA-606-B Cabling Subsystem 1 far end identifier for work area equipment outlets?

We are moving to TIA-606-B for labeling. I have read most of the TIA-606-B standard. Some parts I have only skimmed, while others I have studied in depth. I do not understand the rationale behind the identifiers for Cabling Subsystem 1 links…
Xevious
  • 211
  • 1
  • 1
6
votes
1 answer

Cisco HSRP CAM vs ARP timeout

Today we received email from our ISP saying they are performing maintenance on their network so if you have HSRP connectivity with them in that case you need to clear ARP table or reduce ARP timeout We do have HSRP connectivity with our ISP and…
Satish
  • 4,361
  • 12
  • 67
  • 120
1 2 3
…
99 100