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Questions tagged [traffic]

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How to set up a server to allow the root user to track down historical outgoing requests?

I woke up this morning and found an unexpected outgoing spike in traffic from my virtual server. What commands/settings should I have been using to allow myself to track down the who/what initiated ...
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3 answers
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How to monitor outbound bandwidth usage in Linux?

Currently I use vnstat to monitor my bandwidth usage. What I want to achieve is to get data for making the decision whether to stay in a more expensive but unlimited cable based plan, or to switch to ...
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RPi4 (pivpn) - how to route traffic from vpn-client on wlan0 through eth0 into LAN and back?

An external company needs vpn access to a specific PC. On this PC (Win10) a program is running which is to be controlled remotely via rdp. This PC then connects to a server (Win10). I want to avoid ...
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iptables NAT With traffic shapping

I have centos 7 as BGP Router with FRR, and have 2 interface 1. Public 1. Customer . On Public interface i put mikrotik as traffic shapping . There's 2 block with private IP (10.11.12.x/24 and 10.11....
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why nethogs & iftop numbers for sent traffic are not correlating

I am trying to understand the root cause of my high network egress.. GCP network monitoring shows approx 600 KB/s and bills accordingly If I do iftop on my VM, the sent (Tx) traffic sort of correlates ...
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Network monitor group by process on linux system

I'm developing a client into a Raspberry hardware with an IoT sim with limited data traffic. My software architecture consist in more processes and each of these send log to a remote server. During ...
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3 votes
1 answer
122 views

Why is my server using a well known port as source port

Is it normal that my server is requesting 8.8.8.8 dns with 22/udp as source port? How can i get it to use unregistered ports only
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Traffic won't go through Remote Router

I am currently trying to deploy a Server which is supposed to connect via a deman-dial in connection to a different companies network. The demand dial in connection has been set up on Windows Routing ...
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1 answer
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how to limit traffic usage per user?

we have a server with four users with limited 60TB in/out traffic per month, but we're not splitting the cost evenly and we are wondering if it is possible to limit traffic for each user, based on his ...
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1 vote
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Iptables Forward All traffic to different interface except local inter-lan

I have Two LAN Local LAN: 172.30.30.0/24 with gw 172.30.30.254 Remote LAN : 192.168.2.0/24 with gw 192.168.2.1 both lan can communicate and ping each other devices. i have introduce new machine 172.30....
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Centos 7 server traffic blocker

Sometimes my website is lot of traffic and looks it is very slow. Log details can see someone ip address do lot of traffic to server. I need reboot my server so speed come back to normally. It is ...
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Are firewall logs filled with incoming SSDP requests typical for networks with a Windows 7 box?

While reviewing firewall logs that were sent to me from a Windows 7 box (the box is not a server) on a tiny network, I saw thousands of incoming SSDP UDP entries. The SSDP entries were nearly ...
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1 answer
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Can missing HTTP referrer's identify web crawlers?

I am currently trying to analyze the traffic of a website. Besides specifics regarding the requested resource and timestamps, the tracking system only provides the request's HTTP referrer. In most ...
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Can I route traffic to a connected VPN based on a given hostname?

The company I work for (small startup) has setup a VPN to add an extra layer of security to the services we connect to (say, for instance a Wiki). We, the employees, work from home and connect to the ...
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BigBlueButton getting unusaul traffic

We are running a bare-metal server which can handle 400 concurrent video conferencing users. We are using BigBlueButton application for video conferencing. It was running smoothly for the past 6 ...
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1 answer
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Cost-wise, what's the best approach to hosting a very high traffic server?

I have a server that generates a high traffic amount from unique content (live video chat), and need to be able to handle UL traffic of about 500-1000 TB per month, but have relatively low CPU needs (...
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How can I get the current network in/out values of any NIC of a VMware ESXi host server?

I am aware that IF-MIB provides input and output values for any NIC of a target device via SNMP. Recently a sysadmin compared the values of a specific NIC of an ESXi host server in our VCenter with ...
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What is this kind of continuous traffic generation against production called?

Traffic to our service is not entirely predictable. To help keep the service slightly over-provisioned and to provide advance warning of any degradation resulting from an increase in traffic, we ...
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5 votes
1 answer
3k views

Where are nftables counters logged/stored, and how long do they persist?

I'm attempting to track the total data being transmitted from a specific set of IP addresses (both IPv4 and IPv6) using nftables with a named counter on the rule. My goal is to be able to track this ...
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Can I limit the scope of ntop to only monitor a specific connection?

I need to be able to track client data usage between their VM and an S3 compatible object storage bucket (accessed via https). I've installed ntopng community edition on the VM and right now it's ...
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Internet packages went crazy

So... I have a router (wireless, ASUS RT-N18U), connected to 4 pcs via cable and 1 tablet wireless. After I noticed some performance drops in my network speed, I checked the traffic manager. The ...
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Can PRTG monitor IP traffic?

We often use MRTG For Windows to monitor interface traffic. Now there is an additional requirement: can I use MRTG to monitor IP traffic? If the 10.10.10.0/24 goes through the interface, can I ...
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Monitor Windows Server network data transfer [duplicate]

I would like to monitor the amount of data transferred (Network Out) in a Windows Server. The traffic is composed mainly of files downloaded from IIS. Is there some software or Windows Feature that I ...
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1 answer
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Is there a way to listen to all traffic on my router, using e.g. Wireshark or tcpdump?

I have a crazy stupid problem driving me to an early grave and I'm trying to trouble shoot what the problem is. Is there a way to listen to all traffic going through my router, including dropped SYN ...
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2 answers
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Does me hitting the serverfault site during routine maintenance cause the server/sysadmin team issue?

Not sure if this belongs here, but had the thought while trying the hit Stack Overflow during routine maintenance. Does me hitting stackoverflow.com when its down cause issues on the servers? If ...
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1 answer
2k views

Monitor all requests and responses originating from XAMPP's apache server

I am using Windows 10 and XAMPP to do local php development. I need to capture traffic originating from the apache server XAMPP uses but I can't figure out how. I'm using Fiddler and I can see my ...
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many connections to one of our website

We are hosting multiple websites with Nginx as an SSL terminator. All traffics are proxied through Nginx to backend servers. There are many connections to one of our websites, netstat shows: # ...
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Strange (mail related) traffic on my server

I'm noticing strange traffic on my webserver which is around 50kbps constantly. Doing a (few seconds worth of) tcpdump on the specific ip address, I get this (pardon the huge list): 09:33:02.385238 ...
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4 votes
1 answer
567 views

Using tc to decrease bandwidth to a specific destination address

I am trying to find the shortest path between two hosts H1 and H2 using Dijkstra code. Setting a condition in one of the switches on that path. the condition is: if the packet sending to H2 then ...
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Configurable Stateful Traffic Generator Advice

I need a traffic generator tool which I should be able to configure followings; Number of Packets Number of Sessions Number of TCP, UDP packets Average number of packets in a session Average packet ...
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1 answer
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Unusual hits in Apache log for localhost site

I have an Apache 2.2 webserver running on Windows 7 with six virtual hosts set up. Domain name A points to ?:/.../urls/1/ Domain name B points to ?:/.../urls/2/ Domain name C+D point to ?:/.../urls/3/...
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2 votes
1 answer
1k views

Analyzing traffic by tcpdump between HAProxy server and mariadb

I was testing tcpdump too see the traffic between HAProxy server and mariadb server. These are the results: 23:07:22.328958 00:0c:29:a9:28:a8 > 00:50:56:b0:e0:ea, ethertype IPv4 (0x0800), length ...
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Route traffic to the internet through router and Mikrotik firewall

I would like to request your help to understand whether my diagram is correct, at least conceptually. Im trying to set a network environment from almost scratch. We have a fixed IP provided by ISP. ...
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Establish VPN connection from a client behind a Debian router

EDIT : My searches leaded me to GRE packets : they seem to be exchanged on IP port (not TCP one) 47. It seems to be quite painful to handle it with iptables. So question become : how can I transmit ...
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1 answer
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Traffic drop after HTTPS Magento

we have a Magento store, that we switched to https. Now 2 weeks after, we got a drop about 30%... What could be the cause? I followed every step that was recommended. I requested a reindex via search ...
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2 answers
227 views

Weird traffic on all interfaces simultaneously. (Linux)

Every now and then, I check my munin graphs on my production server to see if there's anything out of the ordinary going on. Today I noticed a strange thing. Identical traffic spikes on all (8) ...
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2 answers
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Machine connected to a vpn not reachable anymore from the outside

My raspberry is connected to my lan network 192.168.1.0/24 and it has a static ip. From the outside I can reach it by opening some ports on the ISP router. I have installed an openvpn client on it ...
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1 vote
1 answer
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TC- HFSC : Can we have TC rule to set classes with minimum guarantee, but no maximum limit?

Can we set a rule where i can specify that my particular traffic will get minimum b/w no matter what, but no max limit if bandwidth is available. Eg : I have 20 mbps line. i want to set minimum 5 ...
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2 votes
3 answers
6k views

how to prevent image hotlinking in nginx?

I am trying to implement image hotlink protection problem in nginx and I need help. I have a huge issue of my site's images being submitted to social networks like StumbleUpon with a direct link like ...
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1 vote
0 answers
181 views

How to find out what causes excessiv incoming traffic?

On a simple webserver configuration (CentOS 7) with nginx/apache (reverse proxy setup) I have a lot of incoming traffic on one NIC (eth0). 1. Is there a way to find out what causes it or "where it ...
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1 answer
702 views

Squid bandwidth control with both source and destination

let's say I have three subnets: 192.168.0.0/24 with 100 mbps uplink 192.168.1.0/24 with 100 mbps uplink 192.168.2.0/24 with 500 mbps unlink I need to limit the bandwith against example.com so they ...
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1 vote
1 answer
79 views

how do I tune for one-day-a-year traffic [duplicate]

I run a site as a service for the statewide high school swimming community. I do this for love of the sport, so I can't spend a ridiculous sum on hosting, etc. Nor do I need to - except for one day a ...
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1 vote
1 answer
191 views

Why do I have a very high ARP traffic while running linux 4.10.13 with docker 17.09.0-ce?

I have a linux machine set up with docker that is running around 40 containers. I've noticed that the ssh connection feels really slow and all externally available services are laggy. On the ...
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1 vote
1 answer
366 views

tcpdump - how to track the source of requests made with ephemeral/dynamic ports

I'm trying to identify the network traffic between multiple backend microservices running on the same server. (they make some rest http calls to each other) Unfortunately, when i use tcpdump, the ...
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0 answers
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OpenVPN not redirecting all traffic to VPN tunnel when local network is 192.168.x on both sides [duplicate]

I've setup a OpenVPN server using tun and udp and enabled the options for redirecting all internet traffic and pushing lan to clients. In the HOST NETWORK The OpenVPN Server is configured to dish out ...
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1 answer
1k views

how to scale a high traffic server? [closed]

I'm very confused on techniques for scaling servers Say you had one high traffic server running on one computer with one 12 core CPU, and one server for a database. For a while that would work, but ...
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1 answer
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Forward Between interfaces On Mikrotik

im having a trouble ive a mikrotik router with 2 interfaces up ( let's call lan1 and lan2 ) Lan 1 has the IP 192.168.100.1 lan 2 192.168.0.32 Lan1 the other side of the wire goes to a cisco wich IP ...
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3 answers
460 views

Current Network Load on windows/linux

Is this possible to know via command line the network load on remote linux/windows machine . Like we can get cpu load i.e. cpu is 75% used.
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1 vote
1 answer
21k views

Mikrotik - Add second WAN IP and route specific traffic

After 20 pages of SO results about Mikrotik and some more google results, I'm come here, down on my knees to request some enlightment. I have a network with static IP and some public IP (248 mask). ...
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How to display traffic information in a parsable format?

tcpdump is my go-to tool to analyze traffic (together with Wireshark when I want an easier review of the pcap file). This fantastic tool fails however to deliver a predictable and easy to parse ...
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