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Questions tagged [ethernet]

For questions relating to Ethernet networking, as defined by the IEEE 802.3 standards.

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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 ...
Stephen Craven's user avatar
3 votes
0 answers
254 views

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/...
Mike's user avatar
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3 votes
3 answers
143 views

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 ...
Lewis's user avatar
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1 vote
0 answers
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Setting the EVPN VXLAN Interconnect ESI for Data Center Interconnect (Seamless EVPN VXLAN Stitching)

With reference to Juniper Networks , when implementing data center interconnect (DCI) using seamless EVPN VXLAN stitching , why do we have to define iESI (interconnect ESI) to stitch VXLAN VNI from ...
Nabeel's user avatar
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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 ...
Enes Doğan's user avatar
1 vote
0 answers
383 views

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 ...
bdes31's user avatar
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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 ...
Shady Atef's user avatar
1 vote
1 answer
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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 ...
Shady Atef's user avatar
1 vote
0 answers
49 views

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 ...
fsociety's user avatar
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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 ...
John's user avatar
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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 - ...
phenetas's user avatar
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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 ...
Ron Vince's user avatar
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0 votes
1 answer
100 views

Cannot get my servers on the same broadcast domain as backbone gateway using Aruba switches

My supervisor told me to go to the server room and connect a bunch of servers to the Department network so they are accessible from office PCs. In the server room we have 7 servers, a couple of wall ...
Amjal's user avatar
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2 answers
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How to connect HP 2930-8g to the cisco CBS350-8g switch unmanaged?

I want to Connect HP 2920-8g to CISCO CBS350-8g. I tried HP sfp ( J4859D ) in HP and CISCO working fine, with HP and Cisco switch and cico sfp (MGBLX1) and programmed switch(config)# allow-...
Instrumentation Systems's user avatar
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2 answers
329 views

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 ...
Arahasya's user avatar
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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 ...
Ltjbuk09's user avatar
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0 answers
286 views

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 ...
Wurlitzer's user avatar
  • 101
0 votes
1 answer
189 views

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 ...
R Kay's user avatar
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1 answer
971 views

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 ...
manula's user avatar
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0 answers
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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.
israa imnati's user avatar
0 votes
0 answers
85 views

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 ...
Phill Donn's user avatar
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0 answers
396 views

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 ...
logic_bomb_walter's user avatar
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33 views

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 ...
BruceMax's user avatar
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0 answers
196 views

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 ...
Maicake's user avatar
  • 101