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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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1answer
28 views

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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1answer
31 views

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'...
4
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2answers
120 views

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 ...
0
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1answer
33 views

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 ...
0
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1answer
73 views

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 ...
1
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2answers
42 views

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 ...
1
vote
1answer
115 views

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. ...
5
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4answers
185 views

Packet Collison Avoidance

If a wireless network has collision avoidance, how comes the network slows down if more clients connect to it?
2
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2answers
64 views

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....
6
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1answer
405 views

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 ...
4
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2answers
409 views

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 ...
1
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2answers
581 views

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 ...
2
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1answer
605 views

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 ...
2
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3answers
2k views

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 ...
1
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1answer
672 views

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 ...
2
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2answers
563 views

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 ...
0
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2answers
85 views

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 ...
1
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2answers
536 views

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 ...
1
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1answer
299 views

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 ...
2
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3answers
1k views

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 ...
1
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0answers
28 views

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 ...
1
vote
1answer
107 views

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 ...
7
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1answer
53k views

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
1
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1answer
523 views

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?...
1
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1answer
105 views

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 ...
0
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1answer
285 views

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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2answers
534 views

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 ...
1
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2answers
85 views

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, ...
1
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2answers
252 views

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 ...
1
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2answers
111 views

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 ...
2
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1answer
1k views

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 ...
3
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1answer
422 views

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 ...
2
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3answers
4k views

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 ...
3
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1answer
11k views

TCP and Go-Back-N

While studying about TCP i notice that is very similar to Go-Back-N, but ,i think i'm missing something very important: In http://www.ccs-labs.org/teaching/rn/animations/gbn_sr/ we can see that in ...
1
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1answer
4k views

tcpdump not capturing all TCP packets when capturing whole packets

I have a server and a client on different machines and on different locations. I'm trying to capture TCP packets with tcpdump on an interface of the server machine. I've injected an identifier in the ...
2
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2answers
48 views

What NIC card should do before transmission

When a computer X is about to send a set of frames over the network to computer Y, should the NIC card of the computer X notify the other computers' NIC cards on the same communication link before ...
0
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1answer
692 views

troubleshooting packet loss [closed]

I know this is a question with maybe too many possible answers, therefore i'm trying to reduce the number of path to explore. From what i've read so far, packet loss can be caused by hardware ...
2
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2answers
634 views

1522-byte frames from access point being dropped by gateway

EDIT 2: This may be a bug in the kernel or module. Reported here https://bugzilla.kernel.org/show_bug.cgi?id=109471 Can anybody confirm that this phenomenon is definitely out of spec? Original: I'm ...
5
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1answer
941 views

Dropping packets routed between VLANs

I have a star topology consisting of 12 switches. Recently, we began running low on available IP addresses (192.168.100.0/24) and I was asked to open up a new scope (192.168.50.0/24) on the DHCP ...
1
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1answer
108 views

Should using full bandwidth cause packet loss and latency (domestic cable service)?

I'm noticing large spikes of packet loss when using maximum of my 30/1 HFC cable connection. Is that normal, or should I talk to my ISP? E.g. when downloading something at close to 30mbps or ...
0
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1answer
819 views

Packet loss within private network (server to server). No packet loss between gateway and server

I am troubleshooting a bizarre case of packet loss. We have a cabinet of servers with a top of cabinet switch (Brocade FESX648-PREM). That switch runs BGP sessions with our transit providers. We have ...
1
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1answer
70 views

Outer routing switch - collisions and packet loss

Currently I have experienced collisions and packet loss on an outer routing switch (1-2% from the States and above 6% when tested from Europe). In a basic way infrastructure looks like Where outer ...
1
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0answers
65 views

How to monitor the D-Link DWS-4026 based wifi network [closed]

We have a dws-4026 and 22 access points attached to it, with 9 vlans on every access point. Once in week we have terrible wifi connection in our building, sometimes the rebooting of the controller ...
1
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1answer
328 views

How to change network buffer of network interface to get errors?

I tried with sudo ethtool -G eth0 rx 1020, but im getting this error Cannot get device ring settings: Operation not supported. Is there any other way to change network buffer to simulate NIC card ...
1
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1answer
551 views

Get packet loss from Open Flow switch

I am using an Ryu controller (3.22) to monitor switches (Open vSwitch 2.0.2, supporting Open Flow 1.3), which are a part of virtual network created using mininet (2.1.0). It is a tree topology with ...
0
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2answers
938 views

Suddenly high ping [closed]

Today i had an issue with my ping, usually i get around 80-100 ms on yahoo.com and in worst cases with hosts that are far from me i get max of 250ms. But today i just had a weird problem that my ping ...
0
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1answer
1k views

how can you see what ip/mac/hostname is connected to a switch port [closed]

was wondering if there is a way for me to actually see which ip/hostname/ and/or mac address is connected to a certain port of a switch. lets say I have a 50 port switch, and a cable is going bad and/...
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5answers
850 views

Measuring packet loss caused by bad reception or interference

Is there a way to measure packet loss on a wifi network that is caused by bad reception or interference? I would like to measure it from the client side without moving the computer or access point.
2
votes
3answers
10k views

What causes packet loss when using full bandwidth from ISP?

We have a small, local ISP that is having some networking issues and I'm trying to understand the cause to better communicate with their network guys. I work with a number of companies with different ...
6
votes
2answers
376 views

Why do wireless signals interfere with themselves regularly?

I come from a computer science background but physics is not presently one of my strengths. I've been reading some research regarding multi-hop routing of wireless (ad-hoc) networks such as this paper ...