Questions tagged [ethernet]

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

18 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 ...
2
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4answers
296 views

Access a subnet through another network

We have some devices connected together through a switch. We need to access them through another network, but because of limitations in available IP addresses, we can't get an IP address from that ...
2
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0answers
142 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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0answers
154 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
844 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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0answers
47 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
102 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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0answers
251 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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0answers
191 views

Is there an acceptable ratio of pause frames?

At the risk of asking an opinion question, are there any guidelines/practices that specify a threshold where the number of pause frames indicates a problem? The ratio of transmitted pause frames to ...
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0answers
91 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 ...
0
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1answer
29 views

RSTP sending BPDUs out of the network switch?

I need some information about RSTP If the port state is blocking, discarding alternate . Should BPDU be sent to external ports? I cant see any BPDU in wireshark if the port states Alternate,Discarding ...
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2answers
45 views

In practice, how much can the 100m ethernet limit be pushed?

I am faced with putting an outdoor WiFi access point about 800 feet from the nearest building. There is no power at the far end. This will require a weatherproof AP that accepts PoE I've looked at ...
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0answers
20 views

Juniper MX - ERPS over MPLS CCC or VPLS

I wonder if there is a possibility to implement an ERPS Ring over a few Juniper MX nodes that are interconnected via MPLS only? The only idea i have to configure this is using lt - interfaces with a ...
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0answers
18 views

using SNAP/ LLC on ethernet

Why is it not desirable to use Logical Link Control (LLC) and Sub-Network Access Protocol (SNAP) on Ethernet 802.3 frames while carrying IP packets when it is often used for wireless networks?
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0answers
14 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
58 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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54 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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0answers
234 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 ...