Packet loss occurs when one or more packets of data travelling across a computer network fail to reach their destination.

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Can't ping between two VMs

I have two VMs that, up until yesterday, have been able to talk to each other just fine. Now they don't. I've been trying to get this fixed for several hours now, but haven't been able to figure ...
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23 views

Kvm virtualization packet loss on guest machine

In Ubuntu 14.04(64-bit) by using KVM virtualization and bridging network I have about 10% packet loss in my guest machine and I have no packet loss on host machine. server1@xxxx:~$ uname -a Linux ir1 ...
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1answer
35 views

Is it normal to have HTTP 499 errors in 1 out of 4000 requests?

I made a website, behind CloudFlare, and sometimes I get an early terminated (nginx 499) request, which is really hard to work around in the codebase. This happens in about 1 out of 4000 requests. ...
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1answer
57 views

Troubleshooting packetloss

I currently own a couple of CS:GO gameservers which are hosted in Germany (hetzner). Recently (for the past weeks) some people have been getting weird lags (getting slightly teleported back, some of ...
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15 views

TAP0 Drops Packets when OpenVPN Run Through VMWare Workstation

I have an Ubuntu 14.04 Server on Amazon EC2 running OpenVPN server and am running udp bandwidth tests with iperf3. In this case, the OpenVPN Server is running as the iperf3 server as well. When I use ...
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1answer
75 views

VMWare vSphere packet loss

I have a Dell Blade Enclosure with 14 blades and ESXi 5.5 on it. On blade 7 and 14 I have round about 65 % packet loss when I ping the ESXi Management interface. On all other blades there ist no ...
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2answers
110 views

Very bizarre Linux-to-Linux but not Windows-to-Linux packet loss over the Internet

I am right now getting additional grey hair fighting a phenomenon concerning packet loss between machines on the Internet. Check the diagram below. Note that whenever I use "SSH" I could use "HTTPS"; ...
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2answers
47 views

OSX how to drop packets randomly

I am testing the resilience of one of our streaming applications to handle packet losses. On linux machines I normally use iptables to randomly drop packets like this: iptables -A INPUT -m statistic ...
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19 views

ICMP Packet Flood a local device over Wireless AP to figure out packet loss?

I'm using a utility to create an ICMP packet flood/attack called Hyanea since windows doesn't have native support like linux does. I want to be able to test a new AP to see if any packet loss ...
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38 views

Determine which equipment is causing packet loss

I'm connecting from my office to two servers (server 'A' and server 'B') hosted by two different providers. Since a few days, my connection speed to server 'A' has dramaticaly slowed down. Even when ...
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21 views

Packets not being delivered to application

First of all sorry if this is not the right place. So... I have a problem. I'm working on a linux board (the distro is created with yocto, kernel is 3.10.17). I have several network interfaces (WWAN1 ...
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2answers
82 views

How does ifconfig calculate packet loss?

Does the dropped packets output of ifconfig refer to the number of frames lost on the local subnet (i.e. datalink layer) or the number of lost IP datagrams at the IP layer or is it TCP retransmission ...
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1answer
35 views

Printer dropping packets while in standby mode

We have an HP LaserJet Pro 400 M401n connected to a Brocade ICX6450-24P that is having some intermittent connection issues while it is in standby mode. I have a feeling there might be some electrical ...
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0answers
117 views

Server error 500 and packet loss [closed]

Is there any dependence between packet loss and server error 500? I have checked Apache (running on CentOS + WHM/cPanel) access logs for 500s and it looks like random occurrence without any major ...
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1answer
39 views

TCP/IP ack loss between firewall and server

Scenario: Client connects to Server using TCP/IP. Issue: During initial TCP/IP connection setup, the ACK packet [3rd step in TCP] sent from Client to Server has crossed the firewall [evidence from ...
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67 views

Intermittent Network Instability

I have an office network being run by a Linksys WRT1900AC, and I'm experiencing significant, but intermittent issues. I have between 15 and 20 devices connected to it, including computers, phones, ...
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60 views

packet loss rate and netem

I am emulating a network with netem. I wrote a script that changes the network delay according to a linear function from 1 to 50ms every 15 seconds (with a normal variance = 5%). The packet loss is ...
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72 views

ip command vs qdisc discrepancy in dropped packets

I am simulating packet loss via mininet network on Ubuntu 14.04. Why are there no dropped packets showing up in ip command? For switch s3, I have Qdisc (sudo tc -s qdisc show): qdisc htb 5: dev ...
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1answer
137 views

RTNETLINK answers: Invalid argument while specifying packet loss by tc command

I am trying to specify packet loss by tc command on interface (port) 1 of switch part of network I have created using mininet : sudo tc qdisc change dev s1-eth1 root netem loss 0.1% but gettring ...
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1answer
237 views

Track Source IP of dropped packets

I've got a Linux server running CentOS 7, and I've been facing an issue where the RX dropped packet count keeps increasing. I believe it may be caused by a faulty cable/connector in the network; ...
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0answers
46 views

Corrupted files when downloading with HTTP

With my UMTS connection most archives > 50 MB are corrupted when downloading them via HTTP. If I switch to HTTPS the problem is gone. The problem should not reside in my network, because I have an ...
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83 views

ubuntu server dropping packets

I have a Ubuntu server 14.04 running nginx 1.8 with gunicorn. nginx is with 16 workers (1024 connections) system network stat using ss -s command is: Total: 15713 (kernel 0) TCP: 198006 (estab ...
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0answers
55 views

Network sensor for a TCP connection for collecting statistics each second [closed]

I need a Network Sensor capable to gather basic end-to-end statistics (packet loss, jitter and network delay/RTT) of several TCP connections directed to the very same destination (ip-addr:port) on ...
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1answer
63 views

Patch panel confessions

So the old IT guy was a college student with no experience prior to be hired beyond some classes. The one before him had no experience at all and just did his best with what he had. Now I am here and ...
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2answers
5k views

Extreme UDP packet loss at 300Mbit (14%), but TCP > 800Mbit w/o retransmits

I have a linux box I use as the iperf3 client, testing 2 identically equipped Windows 2012 R2 server boxes with Broadcom BCM5721, 1Gb adapters (2 ports, but only 1 used for the test). All machines are ...
2
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1answer
109 views

Fortinet Ascenlink heavy packet loss

I'm working on a company with some Fortinet appliances. One of them is a Load Balancer named AscenLink. The specific model is an AscenLink AL-700. There's a insane problem: a huge packet loss on the ...
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48 views

burnt Switches connected directly to the internet

We got a setup with a switch between the cable modem/bridge and the two router ports. We burn this switch every 6 months, and it has to be replaced. Symptoms are heavy packet loss or in general very ...
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250 views

TCP High Send-q coupled with FIN_WAIT1 status

I'm having a problem with one of my webservers, which is taking minutes to completely render a web page. I had a look at the TCP connection and noticed that I have a very high value in the send-q ...
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131 views

Failover pacemaker cluster, packet loss monitor

It's issue is continued from this. So, i have two test servers in one vlan. srv1 eth1 10.10.10.11 eth2 10.20.10.11 srv2 eth1 10.10.10.12 eth2 10.20.10.12 Cluster VIP - 10.10.10.100 ...
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1answer
306 views

Intermitent Hyper-V Cluster Network connectivity loss - Server 2012 R2

I am running a 3 node Windows Server 2012 R2 Datacenter Hyper-V cluster on three DL560s together with a HP P2000 SAN (FC) and HP 1810-24G v2 Switches. I have been experiencing intermittent network ...
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2k views

Openvpn Packet loss troubles

Hy! I got an Openvpn server on Linux and use it to route all ipv4 traffic from my clients (win7,android, pfsense etc). I finally want to really understand the routing thing, although it works, but ...
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2k views

Troubleshooting Packet Loss on pfSense + Ubiquiti UniFi (Wireshark maybe?)

I'm dealing with an annoying situation in a small network in my church, which I'm the primary volunteer IT caretaker, of about 20 PCs, give-or-take. We're in Chattanooga, home of Gigabit internet, so ...
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2answers
582 views

External ip address being treated as local (ARP asking for external IP's address)

I am using a virtual machine with OpenWRT for routing, on a Linux machine (Slackware). I am trying to configure a host only interface (eth0) as the wan interface. eth1 is Ethernet attached as a bridge ...
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1answer
106 views

Ubunutu 12.04 Packet loss

I have this Ubuntu Server (12.04.2) which sometimes (thrice a day for 5 minutes) it's unreachable through zabbix and SolarWinds Orion. I logged into to Orion server and Zabbix server and did a ping ...
0
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1answer
558 views

UDP packet loss cause

I have two machines connected to the same LAN and multicasting UDP streams at rate of about 30Mbps. Analyzers often show packet losses on one machine, but never on another. What could be the reasons ...
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1answer
503 views

iperf udp sequence number wireshark

I'm using iperf for generating udp traffic and my objective is to measure paquet loss. I wanted to know if the first 4 Bytes of Iperf Data are currently the sequence number.
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1answer
589 views

High ping times and packet loss on Alcatel-Lucent OmniSwitch 9600

We have 2 Alcatel 9600 core switches in a redundant configuration and 2 distribution switches (Alcatel 6850's) on another floor connected by fibre to the core switches. See the diagram below. Pinging ...
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2answers
296 views

packet loss between two specific VMs

I am experiencing some high-percentage packet loss (more than 70%) between two specific VMs in a local network, in a remote cluster (I have no physical access to it). One machine is used as a hadoop ...
8
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3answers
12k views

How to fix corrupt packet error for with rsync for (relatively) large files?

Trying to update files on a server, with the rsync command: rsync -ravq -e "ssh -o ConnectTimeout=2 -o ServerAliveInterval=2 -ServerAliveCountMax=2" --delete ./local_dir user@$SERVER:/dest_dir ...
0
votes
2answers
134 views

Occasional Delay on Website Resources: Packet Loss Due to Bandwidth Cap?

My website loads more slowly than I think it should, due to a few of the assets taking an absurdly long time to download from the server. I've been trying to track down the cause of this. I'm about ...
0
votes
1answer
173 views

Test ethernet port for data loss

We are trying to test the ethernet phy on our linux box for data loss. As of now we just establish a tftp connection to a server to upload and download a file. Whenever a mismatch occurs, it is ...
0
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1answer
583 views

UDP packet loss on Netgear GS110TP

I'm trying to flow data via UDP on two ports of a Netgear GS110TP switch, running the latest available firmware (5.4.2.9). However, I'm experiencing a small amount of packet loss, something like ...
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3answers
625 views

Can high packet loss mean users cannot access my website

A quick question. I tested my domain using the following site http://cloudmonitor.ca.com/en/ping.php It showed high packet loss in all countries. Packet loss of 70-100% Does this mean my site is ...
0
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1answer
421 views

TCP packet filter based on TCP sequence

I need to build a test environment with a very precise packet loss based on specific TCP sequence or, optionally, on payload content. I couldn't figure out how to do it with tc or iptables. What tool ...
2
votes
2answers
1k views

Unexplained 0.1% packets time out when pinging from router

I'm troubleshooting a customer who requires the ability to send 5000 pings from the router to their remote site over a satellite link with zero timeouts, yet they keep experiencing one to five packets ...
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0answers
196 views

Cannot connect to Windows Server 2008 R2 via http, https works

I've been having a problem with my WS2008R2 server ever since I started IIS7 for the first time. I've been managing to work around it so far, because https access works normally. http, however, has ...
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votes
2answers
939 views

How to anticipate spanning-tree changes to prevent packet loss during convergence?

We have a LAN with Cisco switches, redundant cabling and spanning tree. If I understand it correctly, when I pull out a redundant cable (that is currently "used" by the spanning tree) it takes several ...
3
votes
1answer
2k views

Analysing incoming TCP packet discards on GNU/Linux

I use Ubntu 12.04 Server as a gateway/router. The server has two NetXtreme BCM5721 Gigabit Ethernet PCI Express cards for LAN and WAN interfaces. Opennms monitoring software shows incoming packet ...
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1answer
98 views

Network packet loss and major connection issues

We've just swapped isp and have set our network up exactly as it was. We are having really bad connection issues on our network to outside sites. Running Ping Tester we are getting about 13% loss when ...
2
votes
1answer
480 views

Nagios, Cisco switches, lost packets

I use Nagios to monitor about 30 Cisco 2960 switches (check_snmp_load, check_snmp_int). I only check load and one or two backbone interfaces of every switch. I get a lot of false positives caused by ...