Questions tagged [ethernet]
For questions relating to Ethernet networking, as defined by the IEEE 802.3 standards.
23
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 ...
- 666
3
votes
3
answers
100
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 ...
- 31
2
votes
0
answers
225
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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
vote
0
answers
41
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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 ...
- 11
1
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0
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363
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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 ...
- 1,085
1
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0
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190
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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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0
answers
1k
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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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0
answers
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 ...
- 893
1
vote
0
answers
107
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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
vote
0
answers
454
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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 - ...
- 733
1
vote
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
votes
1
answer
66
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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 ...
- 1
0
votes
2
answers
45
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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-...
0
votes
2
answers
203
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 ...
- 101
0
votes
0
answers
81
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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 ...
- 1
0
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0
answers
191
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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 ...
- 101
0
votes
1
answer
158
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 ...
- 1
0
votes
1
answer
717
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 ...
- 1
0
votes
0
answers
50
views
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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0
answers
67
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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 ...
- 101
0
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0
answers
318
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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 ...
- 1
0
votes
0
answers
168
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 ...
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