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Questions tagged [packetloss]

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

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Ping packet loss even though the target is reachable. Does this mean packets are eventually getting through?

If I do ping 8.8.8.8 sometimes it returns the following for a period of time: From 172.22.1.1 icmp_seq=36 Destination Host Unreachable But at other times it does reach the target and yet it says ...
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28 views

Analyze Packet Loss Bursts

I need to analyze packet loss bursts in TCP streams. Given a number X a packet lost burst is when more then X consecutive packets got lost. So I have a pcap file and need to count how many bursts ...
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ICMP packet size over 372 are dropped on bond0

i have a target server running on rhel7.4 with kernel 3.10.0-693.11.6.el7 with bond0 and subinterface vlan2001 with MTU 9000 when i ping from a different server which is in a different network with ...
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176 views

How to detect packet loss between two Win 10 computers?

I have an issue where an app that is dependent on file locks crashes on Windows 10. The programmers tell me that app is extremely sensitive to packet loss, so I would like to detect what is happening ...
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34 views

losing UDP packets don't know where

my linux server is sending UDP packets to another computer in lan e.g. 192.168.1.100:12345. It happens regularly that remote pc don't obtain packets sometimes. I don't know, if some packets are not ...
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342 views

Packets drop in a Linux node

I've run dropwatch and this is the result I got: dropwatch> start Enabling monitoring... Kernel monitoring activated. Issue Ctrl-C to stop monitoring 39 drops at tcp_rcv_state_process+1b6 (...
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405 views

constant packet loss in internal ESXI network

I am new to Vmware Esxi and im doing testing for an experiment with an Vmware ESXI 6.0.0 server. on the server there is two Ubuntu guest clients with one VMXNET3 each, both on the same Vswitch. Upon ...
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415 views

Linux TCP/IP tuning for low throughput network?

I have two linux machines connected by a radio modem. The bandwidth is about 2kbps, with ping times of around 400ms (5% packet loss). Currently, ssh sessions have a delay in the order of 5 seconds, ...
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63 views

Periods of high packet loss, two ethernet cables plugged into TWC modem

A small business for which I am the system administrator has been experiencing intermittent internet dropouts. There seems to be no pattern to the dropouts — sometimes there is nothing for a week, and ...
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1answer
807 views

Linux bridged network intermittent packet loss (KVM context)

I have a standard bridging setup between the real world and a KVM VM guest. Bridging looks fine: [root@t ~]# brctl show bridge name bridge id STP enabled interfaces br0 8000.40f2e9c6033d ...
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2answers
398 views

multiple macvlan devices and policy based routing confusion

I have a server (ubuntu/debian) with two ISP connections. Both of these WAN connections have multiple public IP addresses. (big pipe)----eth0-->\ > server ---eth2--(...
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1answer
482 views

Fine tune a Remote Desktop Gateway server to tolerate packet losses

I have a Windows 2012R2 server acting as remote desktop gateway for a number of RDSH servers inside the perimeter, and have a firewall between it and the Internet allowing access from outside to that ...
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420 views

Effects of packet loss on video streaming

We are sending an MPEG2-TS/H264 video stream over the network. This video stream is received correctly over the LAN, instead on the other end of a private WAN video quality is poor, thus suggesting ...
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64 views

Unstable ethernet/fiber pc to pc connection Windows

We have two Windows 7 PCs (64 bit) connected to each other directly, i.e. without a router in between, using a fiber connection with two ethernet-to-fiber converters. PC1 uses a Realtek PCIe GBE ...
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1answer
110 views

Detect faulty physical links with ping

I have a question regarding detecting a physical link problem with ping. If we have a fiber or cable which has a problem and generate some CRC errors on the frame (visible with switch or router ...
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1answer
470 views

How can I identify the cause of packet loss in DNS?

We have upgraded some of our routers to Ubuntu 16.04 and are now getting some performance problems with DNS. It seems that packets are sometimes truncated, but I have no clue what else I can do: This ...
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1answer
96 views

Optimize TCP connections between two Linux hosts connected by a long lossy channel

I have two distant hosts. Packet loss is always 19% until the rate exceeds 210 kB/s. The RTT is about 220 ms. The TCP congestion control algorithm is "cubic". "f_rto" is enabled. The actual speed of a ...
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1answer
2k views

High TCP reset and packet drop count on CentOS Linux

I have a small farm of web servers (HP Proliant and IBM x, with Broadcom Corporation NetXtreme II BCM5 NIC's) running Apache 2.2.15 on CentOS 6, behind a Cisco ACE load balancer, serving a PHP/JS ...
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1answer
3k views

What is an expected TCP retransmission rate

I have a direct connection setup between my NAS and server with two gigabit links bonded in mode 0. I also have a single gigabit link from my server to my network. I want to test how the bond is ...
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2answers
181 views

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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1answer
9k 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
114 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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1answer
695 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
565 views

Packetloss over Internet for “Linux-Linux” but not for “Windows-Linux” (tl;dr: it's MTU)

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
485 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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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 occurs....
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65 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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2answers
451 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
338 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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1answer
224 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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222 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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179 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 1%....
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1k 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
953 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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113 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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81 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
107 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
21k 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 ...
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1answer
448 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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59 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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712 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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400 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
810 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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4k 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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4k 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
2k 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
130 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 ...
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1k 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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2answers
2k 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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1k 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 ...