Questions tagged [packet-loss]
For questions about packet loss, where one or more packets of data travelling across a computer network fail to reach their destination. This is typically used in troubleshooting, where either the physical medium or network medium has a defect.
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How to define packet loss
I found that "Packet loss describes lost packets of data not reaching their destination after being transmitted across a network." So, we can say that it is a portion of transmitted packets ...
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Are UDP packets "retransmitted" when dropped by an edge router inside an SSH Tunnel?
A network architect was recently asking about enabling DSCP on tunnels that I create for a VPN-like solution I maintain using ssh to maintain tunnels on linux devices. I thought this was odd because I ...
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"Expected" packet loss under heavy network load in TCP cubic
context
We have two machines that receive a lot of data, and mirror each other's content with rsync. When monitoring these boxes via ICMP echo requests (using the mtr tool), we see up to a couple % of ...
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Why does TCP sender drop rate 50% on lost-packets?
Why is the standard TCP sender response to packet-loss (congestion), to drop 50% of the sending rate and then start working back up ?
If packet-loss was 20%, why not just drop 20% or maybe 25% to be ...
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Is There a Max Number of In-Transit UDP Packets? [closed]
I am sending some data over UDP from client to server using sendto. I noticed all the data was not being received. I began logging (printing) each packet sent on the client, and just the act of doing ...
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What is responsibility of different layers of OSI model and intermediate devices between sender and receiver when data packets are lost/corrupted?
Suppose sender sending some data to receiver and there are 3 routers between them. R1, R2, R3 are routers.
Now sender starts sending data packet D through it's AL, TL, N/W L, DLL,PL to router R1 ...
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pathping command 100% packet loss
this is the real example of pathping command.
According to my knowledge:-
Source to here column :- it tells about number of packet loss out of 100 send directly to hop
Node/Link column. :- it tells ...
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Should Bit Errors Cause Loss Proportional To PDU Size?
Should I expect random (or even regularly-occurring) bit errors to cause corrupted/dropped PDUs (packets) proportionate to the PDU size ?
Troubleshooting high (0.01% to 0.1%) packet loss over a short (...
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Unwanted Wireshark Optimizing Received 802.11 Channel for Frames
I am trying to run an experiment which involves monitoring 3 wireless channels simultaneously in Wireshark which would allow me to see a single frame captured 3 times on each channel.
To do this, I ...
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Is there any research that tracks fragmentation and drop rates of UDP packets based on size?
I'm designing a P2P system. I need to decide an ideal packet size that maximizes the efficiency of my system. This answer claims a 508 bytes is the maximum safe size, but I believe larger packets ...
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How to send 10-20KiB with UDP semantics? [closed]
I have volatile traffic, of 10-20KiB, that I want to send with UDP semantics.
I have measured packet loss between several servers across the internet. In testing, I can reliably get 32KiB UDP packets ...
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What is an acceptable loss with external networks? [closed]
Based on my reading here, any traffic loss on the internal network should be quickly addressed. However what is an acceptable level of loss one can expect when communicating with external networks? ...
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Suspect MTR showing incorrect packet loss through router; other tools are not showing loss
Using MTR (sending TCP with or without SYN), I'm consistently seeing packet loss on one intermediate router in the path. UDP does the same. I'm use TCP to avoid the ICMP packet flood limits set.
I ...
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How to check cable without ping?
Is there any way to check if a network link is physically working, without using ping?
Recently bought a Power-Line-Communication device, and I wanted to test if it works. Before pinging the machines ...
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Reason for congestion in CSMA based networks
A typical channel with SNR 10dB and BW 10 MHz will have a channel capacity of something around 150 Mbps. In CSMA, at any given time, only 1 user is allowed to transmit and in 802.11p, the default ...
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How to score links in a network represented as graph?
I am working on an academic research about networks. I have proposed my model a a graph that nodes are users with commodity hardware connected to each other via internet as graph links. I know this is ...
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Routers and output buffers: Why can two devices interfere with each other and cause latency?
I apologize if this question has been asked already because I couldn't find anything related. I'm a beginner in networking and am reading through Computer Networking: A Top-Down Approach, as well as ...
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Bonding and switching between 2 different Links/WANs/Interfaces
Before I ask anything, I'd like to say that I pretty much searched a lot (to what I know of from keywords and terms such as "bonding" "wans" "links" "failover" "aggregate") and I couldn't find any up ...
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How to troubleshoot VPN packet issues? [closed]
I'm a web developer (10 yrs), and am tech savy, but don't know a lot about networking, so please forgive my ignorance. I work from home, so I'm always on my company VPN.
Over the last several weeks I'...
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Cisco ASA 5585X Internal-Data0/1 interface errors
I have noticed on Cisco ASA 5585 (SSP-20) interface error counter going up specially overrun but so far we haven't seen any production impact or issue, error rate is low so its not noticable but would ...
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How is a lost DNS query handled [closed]
If a DNS query gets lost along the way to its destination, is nothing done about it? In my networking class, my lecturer said that DNS runs on UDP. I verified this in Wireshark by doing nslookup for a ...
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Weird packet lost. Looking for some input
Like me start by saying I'm not an network expert but this situation got me scratching my head and you guys might be able to help.
The infrastructure is 4 switches (Dell 2848). 2 For the LAN and 2 ...
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Network Packet that allows maximum throughput
I created a basic wireless system between two microcontrollers. Each uses the on-chip UART and an HM-TRP radio module to communicate with each other. Eventually I'll have a master-slave setup where ...
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With large file transfer packets are dropped with the error "IDP detection OOO Exceeded Max" on encryption/decryption engine subsystem
We have an in-house application for sending large files. Using TCP/IP this application uploads the files to a server on our main office network and then sends a link to the file as part of an email. ...
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Packet Collison Avoidance
If a wireless network has collision avoidance, how comes the network slows down if more clients connect to it?
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Will packet loss get bigger if the hop count gets bigger?
This is a general question.
Will a packet loss get bigger if there are more hops (and thus more milliseconds) along the path?
Say, I ping a server1 from its default gateway R1 and get 2% packet loss....
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Cisco Nexus 3064PQ CPU spike causing packetloss
Nexus 3064 CPU spike and packetloss
I have L3 Cisco 3064PQ switch which is running latest "nxos.7.0.3.I4.7.bin" basically I am using for routing so my ISP 2x10Gbps link terminated (with LACP) on ...
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High Jitter and Data Loss on Cisco Meraki Z1
Our office is running a Cisco Meraki Z1 Security Appliance and recently (March 5th) the internet has been dropping out intermittently. The appliance remains online but the internet either doesn't work ...
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What could cause network to duplicate packets? STP during convergence?
I have understood that real networks have routing changes, leading to out-of-order delivered IP packets. Real networks also have frequent packet loss.
However, what I have not understood is why could ...
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Intermittent periods of high packet loss, one hop beyond router
I've been trying to diagnose internet connection issues at a remote small business for which I am the system administrator. If this is not the proper Stack Exchange to post to, I'd really appreciate ...
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How to find packet loss in Wireshark network dump file?
I am a beginner in Wireshark, and I would like to find some problems with a TCP connection. Basically, I have some sockets timing out, and I would like to find out if the message (packet) being sent ...
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MTU 1500 gigabit connections translated to 9000 jumbo packets over 10 gigabit connection
I'm testing the frame size by adjusting it from 1500 to 9000 for the link to the storage NAS to optimize the 10 gigabit connection and have seen an increase of speed to almost 300% read speeds.
I ...
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How sliding window protocols handle duplicate packets caused by extreme network delays?
Let's say there is a network that sometimes delivers data with extreme delays. And there is a protocol that uses a "sliding window" algorithm for tracking packets acknowledgement. And imagine such a ...
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Limiting NIC speed leads to better video quality
I have two workstations A and B connected to the same L3 switch at 1Gbps. Workstation A generates an MPEG2-TS UDP video stream at 10Mbps data rate. Workstation B receives this stream correctly. The ...
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Cisco SG-300 dropping lots of packets
I have three new Cisco SG-300s operating in default settings. These are connected to two WatchGuard M300s in a HA configuration, with the WatchGuards acting as the router. These three switches connect ...
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TCP and internal packet retransmission
When point A sends data to point B, it's delivered reliably over TCP. If the underlying channel loses data, the TCP stack on point B side automatically asks to re-transmit lost frames.
Let's assume ...
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CRC errors and ICMP packets loss correlation
I would have a question regarding physical problem detection in a link with ping.
The assumption is as follows: I have a fiber or cable with much of noise due to bad hardware (bad cable or bad ...
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Does increasing the FEC decreases the payload in the maximum packet size?
we can find the maximum packet size by the formula
packet err rate = 1 - (1 - bit err rate)^(max packet size)
so does this max packet size include the FEC bits?
I assume this formula gives the max ...
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What happens when an intermediate hop router encounters a packet whose MTU size is more than what it can handle?
Basically if the frame size of a packet is more than the MTU size configured in the router (which is an intermediate hop) the packet is dropped. Since IP does not have any ARQ mechanism, is there a ...
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What does TCP DUP ACK mean?
In Wireshark, I see TCP duplicate ACK packets sent from the receiver to the sender. What does it mean? Does it imply packet loss?
Thank you
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Is a GRE tunnel sensitive to packet loss?
I tested a GRE tunnel on a lousy link, and all traffic seems lagging and slow, but when I switch to a healthy link, everything run smoothly.
Is a GRE tunnel, in general, very sensitive to packet loss?...
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How ethernet links can have a delay and loss
In some simulation environment, such as mininet, you are given parameters when you define your virtual link between switches such as: bandwidth, delay, and loss. I understand a link has a bandwidth ...
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What does limit a MTU set for an interface? [closed]
The maximum MTU I can set is between 9000 an 10,000 for a Ethernet interface.
I have the following message for high values
ifconfig eth0 mtu 10000
SIOCSIFMTU: Invalid argument
What is the origin ...
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Types of packet loss
I am used to the term ICMP Ping Packet Loss but recently, I came across this other term UDP Jitter Packet loss
I will like to know the difference between the two, and of what importance it is to ...
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Upload speed issues with two ISPs on the same tower
I have switched to another ISP because after 2 years of smooth sailing, we started to have upload speed issues and they didn't care. Strangely, the new ISP has the same problem: from time to time, ...
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can the loss of 4 packets in 1000 cause performance issues
A network engineer spotted some packet loss averaging 4 packets in 1000 then some body tried to use that as a cause for a performance issue. Is this a realistic assumption that that sought of loss can ...
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Packet Loss of two in Router>Router>L3SW configuration
So, I am working on this network simulation it is pretty basic.
When I initiate the first ping from 172.25.56.0/24 network to 10.151.0.0/16 network there is a loss of 2 packets. I understand, this ...
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How does a router behave when some of the fragments of a packet is lost?
Consider an example where host-A is sending data to host-B. While the fragments traverses many routers in between, some of the fragments are lost. So now the router identifies this and waits for that ...
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What happens in SACK when there are multiple gaps in the received packets?
Suppose a client has received 0 to 500, 900 to 1100 and 1300 to 2000 how will ACK and SACK look like? Does it look like this ACK: 500 SACK:900-1100 and then it asks for the packets 1100 to 1300 in new ...
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RSTP and PVST mix in switch fabric
We have a Dell stack switch (running RSTP) connected with a couple of Cisco switches (running PVST), and recently, something happened. I'm not sure where, but in our network, we started getting packet ...
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