Questions tagged [ethernet]

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

16 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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175 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/...
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26 views

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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175 views

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 ...
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0answers
1k views

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 ...
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48 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 ...
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0answers
104 views

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 ...
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299 views

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 - ...
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92 views

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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1answer
46 views

If one of hub is damaged,will it cause others hub damage too?why can't i enable the rapid dual homing

There is a multi-ring topology,combined with 8 Hubs and 2 switches,i want to ask two questions 1. If H3 is damage,but the fiber is still ok,will H2 damage too in the future? i have a thinking to ...
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24 views

Dynamic CAK, how MSK is derived at supplicant end?

For MACsec, dynamic CAK scenario using EAP-TLS, MSK at Authenticator is derived from Authentication-server as part of MPPE-Send-Key and MPPE-Recv-Key, which are used to further derive CAK/CKN. I am ...
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96 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 ...
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20 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 ...
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1answer
108 views

What is the wireless bottleneck speed in my simple network map?

My simple Network topology Im trying to figure out what the maximum speed is in mbps on the blue and red links. The exact specs of the wireless networks are these: IEEE 802.11b/g/n, 2.4GHz Dual ...
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70 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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284 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 ...