Questions tagged [traffic]

For questions about network traffic (or data traffic), where it is the amount of data moving across a network at a given point of time. Only use this tag in relation to on-topic network devices.

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Mobile cellular Networks (GSM, LTE, 5G, ...) and MAC addresses

We've been provided with a new firmware for our telematics units, which connects to the Internet via a VPN provided by a mobile carrier; since this new firmware release, we've noticed that each and ...
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0 votes
1 answer
117 views

Why would I need fq_codel? [closed]

I've been studying TC for a while. I came across this answer containing a script. In it we set the egress limit as: # setup bandwidth limiting: tc qdisc add dev "$DEV" root handle 1: tbf ...
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1 vote
3 answers
482 views

Router interface on same subnet

Could someone please explain why can't be have 2 interface on same subnet? Do router use network address to forward traffic?
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2 votes
2 answers
576 views

What's difference between traffic shaper and scheduler?

Can't find a clear answer in Google. Both drop packets when the queue is filled. So why two terms are used? If the shaper includes the scheduler, then what else do the shaper besides the dropping? Or ...
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  • 123
2 votes
1 answer
69 views

How does deep packet inspection (DPI) extract metadata from packets?

DPI software extracts metadata (as an additional function apart from classifying applications / protocols) But how does it do this? For classification, I get that you can use pattern matching or port-...
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0 votes
1 answer
35 views

Newby question: what is the backbone of a script to limit incoming and outgoing network speed, using TC? [closed]

I am new to TC / tc (traffic control), but I need to limit the speed of incoming/outgoing network traffic for a docker container. I read a lot, but still I have a lot of confusion on what is needed. ...
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  • 103
0 votes
1 answer
79 views

is it possible calculate a IP of Transit Traffic's rate in Juniper port mirroring?

In Juniper Router MX480, we can configure the port mirroring of a transmit port. then, is it possible calculate a IP of Transit Traffic's rate in Juniper port mirroring? I mean, I can configure B port ...
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0 answers
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Does the control packets flow into a router/switch through forwarding plane? [duplicate]

I know there are two platforms in any networking device separating the control packets from the traffic, which I call control plane and data plane. My question is, how does the control packets enter ...
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0 answers
136 views

What is the size of an empty 4G network packet (with TCP/IP)?

Fellow users, What is the size of an empty 4G packet (LTE Protocol Stack) with TCP/IP? I'm not looking for the MTU, but the minimum number of bytes necessary to build a LTE Protocol packet with TCP/IP....
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0 votes
2 answers
40 views

what happend when inbound traffics over the limit of bandwidth? [closed]

Sorry for my English. Let's say there is a chat server in AWS and it has bandwidth limit like 5Gbps. Someday, massive user comes and it spikes a lot of traffic in a second and finally it overs 5Gbps ...
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  • 45
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2 answers
495 views

How to monitor vlan using SNMP?

I am a newbie to building a monitor system using Prometheus and SNMP exporter, I have succeeded get metric from the physical interface, but I want to monitor VLAN on a trunk port, is that possible ? ...
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1 vote
1 answer
46 views

Can you gather only a summary of network traffic via Wireshark (or similar)?

Something on my network is using an enormous amount of data and I need to track it down. Its not constant or predictable. I have had a go with Wireshark and I am sure that it could tell me what I ...
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1 answer
50 views

Border links vs backbone links

While reading an article about a traffic classification I came across these two terms, which were unfortunately not explained. It was just said that border links are more suitable for the host ...
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1 vote
1 answer
104 views

Why I cannot see packet loss on GRE over capacity tunnels?

I have the following topology set on AWS where there are 4 CSR 1000v Routers deployed and Segment Routing enabled in which the Segment Routing Headend is R1 and the destination is R3. I aim to send ...
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0 votes
1 answer
87 views

why doesn't WireShark show any traffic from invalid certificate https site? [closed]

i have tried mobile apps like HttpCanary and pc programs like wireshark still got nothing from the site !!
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1 vote
1 answer
279 views

Understanding Throughput of interfaces problem on Cisco Routers

I have the following topology set on AWS where there are 4 CSR 1000v Routers deployed and Segment Routing enabled in which the Segment Routing Headend is R1 and the destination is R3. I aim to send ...
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1 vote
0 answers
67 views

CISCO Meraki - Endpoint API: Get Network Traffic 'sent' and 'received' values

I'm currently developing a Python script with API endpoints, specifically get_network_traffic. My only question is what unit of measure is being used for the returned 'sent' and 'received' values, KB?,...
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  • 111
0 votes
2 answers
70 views

Monitoring URL requests on foundation's LAN

We are having a internet cafe with guests walking in and out. We would like to keep an eye on browsing traffic on LAN 192.168.2.0/24, because we don't want guests to visit wrong websites. In such ...
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7 votes
2 answers
438 views

Where is the traffic going?

Here is a routing puzzle: I'm working on a poorly documented network, and I'm trying to document things as I discover them. R1 is a core L3 switch. R2 is a router. The FW is a, well, firewall. On ...
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  • 62k
5 votes
1 answer
618 views

Analyze Network Traffic by Autonomous System Number?

I'm looking for the way to take an estimate consumptions toward internet per Autonomous System Number which could help me to make a decision if it's necessary to establish a peering with this AS's ...
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1 vote
0 answers
436 views

AWS tunnel TCP retransmissions and DUP ACKs [closed]

I have a IPsec tunnel from my firewall towards AWS, the tunnel is up in both phases. If I run traffic sniffer in the firewall, I can see interesting traffic going through, but there are MANY TCP ...
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3 votes
1 answer
3k views

Difference between junos-host zone and a security zone

As far as security zones are concerned, we apply policies to it to control the transit traffic. And we also apply host-inbound-traffic to a zone or interfaces. If we have both of the above ...
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  • 393
2 votes
1 answer
417 views

Traffic of idle OpenVPN connection [closed]

I have a mobile gateway connected to my VPN via OpenVPN and a 2G connection. Now I observe some unexpected traffic (~20MB / day) and wonder where it comes from. While I'm connected to the gateway I ...
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  • 121
1 vote
2 answers
824 views

Fortigate 60D - WAN Link Traffic Division

Requirement is to divide the WAN zone traffic Two different LAN IP group's internet traffic should go though 2 different WAN connections in fortigate 60D (Currently its WAN Zone(wan1 and wan2) . How ...
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1 vote
1 answer
117 views

What is the general Traffic Flow of 2 Clients connected to the same AP?

If Client A and Client B are both connected to Access Point C and A + B want to talk to each other, does C act as a switch between the two of these clients or does C have to send that traffic back to ...
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2 votes
1 answer
241 views

IPoIB with Netem (Latency emulation) Poor performance

I have to emulate a wide area network. My setup contains two servers with MT27500 Family [ConnectX-3] Infiniband cards. Default latency between both nodes is ~0.4ms and iperf test shows throughput of ...
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1 vote
0 answers
47 views

Policy Map issue on c6848x 15.2(02)SY

I have a problem creating traffic shaping on c6848x. I need to set shaping on output interface to limit and shape traffic to 100 MBs. So far I did this: class-map match-any 100MB-OUT match any ...
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3 votes
2 answers
1k views

ASA cannot ping outside through NAT on border router

I have the following topology below, in GNS3. Basically, the cloud NAT-1 is the Internet, R1 is my border router with NAT and FWASAv-1 was supposed to be able to access the Internet, but can't. I ...
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2 votes
1 answer
2k views

Generating traffic with DF flag set [closed]

is there a tool which I could generate TCP traffic with the Don't Fragment flag set? I used iperf, but I cannot find an option for DF.
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1 vote
1 answer
94 views

Log incoming traffic

Is there any way to somehow log all incoming messages for Network devices, like who pinged my switch or who is trying to connect to my switch and what protocol was used? Is it possible to do it with ...
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0 votes
1 answer
228 views

Generating realistic Internet traffic in NS-3

I want to simulate a network in NS-3 and i want the traffic on this network be the real traffic. I found this article. This tool is based on PPBP (PPBP models on internet traffic) but i am really ...
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10 votes
2 answers
10k views

How `UDP Hole Punching` Works?

Can anyone explain how UDP hole punching works in a simple way? I know how NAT and PAT works, but can't get a clear idea about UDP hole punching.
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  • 573
5 votes
2 answers
2k views

Cisco ISR 4000 Performance Levels, router shaper

I am trying to understand Cisco ISR 4000 Performance Levels. In the document ISR 4000, one can read the following paragraph: It's actually quite simple. The router shaper applies only to traffic ...
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1 vote
0 answers
500 views

Traffic Statistics per VLAN

I'm using Huawei s6720 and I would like to monitor traffic per vlan, example: # Interface GigabitEthernet0/0/6 port link-type trunk port trunk allow-pass vlan 200 300 400 500 # I can verify ...
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