Questions tagged [ethernet]
For questions relating to Ethernet networking, as defined by the IEEE 802.3 standards.
24
questions with no upvoted or accepted answers
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IOS XE minimum frame size
I recently encountered an issue upgrading from an IOS device to an IOS XE ASR 1000 router concerning Ethernet Over SONET (EOS). VLAN tags are used to map traffic from the hub router to SONET ...
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3
votes
3
answers
82
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Wifi solution to connect two warehouses on to same network
I’ve just acquired a second warehouse however it’s approx 100m from my current one.
To save me the headache of having two wifi systems what’s the best solution to bring my current wifi network into my ...
- 31
2
votes
0
answers
210
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Router as PPPOE concentrator, PPPOE clients unable to get to DMZed static NAT server
I've been trying to figure out this problem, and I'm just not up to the task.
I have a Cisco 2911 router as follows:
Internet connection on GigabitEthernet0/1.
Which has it's own static IP: A.B.C.38/...
- 121
1
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38
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Could using punch-down blocks with long stripped ethernet cables cause signal loss or any other issue?
I see it on the internet where people strip and untwist their wires more than 10 cm to use with punch-down blocks. Won't this cause cross-talk or can other noises effect the signal when cables are ...
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340
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How Cisco Line Protocol works
How do Cisco Line Protocol works ?
I could read this: https://www.cisco.com/c/en/us/support/docs/content-networking/keepalives/118390-technote-keepalive-00.html, about Ethernet Interfaces keepalive ...
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187
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How an MKA key server decides if it shall use MACSec and how it announce that?
According to IEEE 802.1X-2010 the standard for defining MACSec Key agreement protocol Clause 9.6, that's how the key-server decides to use MACSec or no.
Each participant advertises whether it is ...
- 133
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How are required Keys inside MACSec Key agreement protocol (MKA) generated?
I am trying to wrap my head around MACSec Key agreement protocol (MKA) and its relation with MACSec and other protocols. So bear with me.
To my understanding in order to MACSec to work, all nodes must ...
- 133
1
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49
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Regarding Physical Connectivity
I have questions regarding the following designs in my test lab:
1.Ethernet port of one switch is connected to TenGig port of the Firewall.Why would anyone do this(connecting Ethernet and Tengigabit ...
- 891
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0
answers
106
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How to encapsulate tapped traffic to forward over L2/L3 network?
I am tapping some 10Gb ethernet links at some remote sites (normal passive fibre taps) for some QoS/QoE monitoring. I don't have any dark fibre options at these sites to send the traffic back to a ...
- 11
1
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0
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405
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Why does NMAp find disconnected devices?
I want to wake up and see the devices connected on my local network, using NMAP.
So I execute this command :
sudo nmap -sn -PU[7] -PE 10.11.204.1/24
(extract from the man page :
sn: Ping Scan - ...
- 713
1
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0
answers
92
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Loop frame case study
Peter Paluch did an experiment regarding loop frame. However I do not understand the connection/cabling on that experiment. Refer statement below.
The switch under test was connected via Fa0/1 to a ...
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0
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2
answers
102
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Connecting L3 and L2 switches with VLAN settings
I have 1 L3 switch with
Static ip - 192.168.0.252
Two L2 switches
Switch A - 192.168.0.250
Switch B - 192.168.0.251
I have created VLANs in L3 switches with 192.168.1.1 and 192.168.2.2 ips abd set it ...
- 101
0
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0
answers
57
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I can no longer access my Dell EMC N1124T-on through its GUI interface
We configured and set up our Dell EMC with a Putty interface first and went through the Set up wizard and gave it a static IP. Then joined it to our network and Deployed it into our IDF. Accessed it ...
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0
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110
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Why are the pins in this RJ45 port not all identical?
As shown on the picture below, the pins on these Ethernet ports are not all the same.
It looks like pin 3, 5, 7 and 8 (or 1, 2, 4 and 6?) are elevated in order to make contact, but not the others.
I'm ...
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0
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1
answer
114
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Which Ethernet cable should l use to connect two office buildings?
I am an extreme newbie in real networking. I have developed an application for our internal office management which is to be installed on 4 machines. One of the offices is in another building around ...
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1
answer
393
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How to connect GNS3 to loopback adapter on Windows 10
I'm trying to have a simple topology by connecting a router (c7200) and the local machine which is windows 10. For this I use GNS3 GUI (not the VM application). I have to do that, due to the limit of ...
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0
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22
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OTN frames: How is partial filling and failed decoding dealt with?
I'm trying to understand some OTN concepts that are not immediately obvious from the G.709 standard documents.
I'm curious about the case of Ethernet frames packaged into ODU frames.
in case the ...
0
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0
answers
21
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PTP nanoseconds synchronisation between slaves
Given the following IEEE 1588 PTP topology:
All slaves are identical embedded devices (hardware and software)
All slaves and the switch has PTP hardware support.
The GrandMaster does not have any PTP ...
0
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0
answers
43
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How to enable ip address for all ports in the Cisco IOS Web Browser
Good afternoon, how do i enable the ip address in webui for the cisco switch you can see the picture below ipv4 is unassigned, everything looks good with me.
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3
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431
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What is the difference between PTP 1588 and 802.1 AS?
What are the use cases where one is preferred over other ?
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46
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Can I use ethernet for point to point communication utilizing broadcast?
Hypothetically if I wanted to make a custom point to point protocol that uses Ethernet, can I use Ethernet in such a way where the two devices communicate with each other by broadcasting their ...
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0
answers
257
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Using GNS3 to Sniffing Packets on Siemens RuggedCom RS900
I am using GNS3 to simulate an environment. I have 4 docker containers which all host Python programs. Three of the devices communicate with each other via the programs (Program 1, Program 2, Program ...
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Can the interface types otnOtu, otnOdu and opticalChannel have metrics such as ifInDiscards, ifOutDiscards?
In my understanding, the metrics "ifInDiscards", "ifOutDiscards", "ifOutErrors", "ifInErrors", "ifOutUcastPkts", "ifInUcastPkts".,,,etc are basically related to the interfaceType ethernetCsmacd.
Can ...
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140
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Why wifi and ethernet use the same frame format from tcpdump -d output?
If I execute
tcpdump -i wlan0 tcp -d
or
tcpdump -i eth0 tcp -d
I get the same output
(000) ldh [12]
(001) jeq #0x86dd jt 2 jf 7
(002) ldb [20]
(003) jeq #0x6 ...
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