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Questions tagged [packets]

54 questions
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Mysteriously dropped packets

I have server with Broadcom Corporation NetXtreme II BCM5706 Gigabit Ethernet chips, and 2.6.18-164.2.1.el5 kernel from Red Hat Enterprise Linux Server release 5.4 (Tikanga). During normal work day this machine gets ~ 40000 packets per second (it's…
user13185
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High count packets rejects in established connections because of timestamp

I am trying to set up a Wowza media server using a Dell R710 with 24GB memory and a 10Gbit connection and all the calculations say it should be able to handle around 20k connections however when I get to around 9000 connections, Wowza starts…
Roger
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In Linux, how do I send packets of a certain size to an IP?

What commands can you run? (must be via the terminal)
Alex
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Why are network packets getting sent to incorrect switch port

All, I have multiple security monitoring devices that lose communication/connectivity on a regular basis throughout the week. I have set up WireShark to monitor the network traffic going to/from one of the switch ports. I see that when…
ClydeR
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In WireGuard on a sending peer, how is packet sent from the `wg0` interface to the UDP port?

I'm trying to understand, once a packet reaches the WireGuard interface (wg0) how is it sent to the UDP port from where it can be sent to the receiving peer. I was reading the WireGuard whitepaper and it says The interface itself has a private key…
dsinecos
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iptables-dropped packet understanding

Today I read in my the below iptables-dropped packet logs and I don't really understand this log. I hope somebody can help me. I only opened an inbound SSH port 2221 and for my outgoing traffic I opened DNS port 53 as protocol UDP. …
beard black
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Under ddos attack, legit packets increase length also?

I would like to know about packets length, for example, with normal traffic (without DDoS attack) packets length is 20-40, which I believe is normal, once DDoS attack starts packets length goes over 1000. I would like to know if these 1000 length…
alfredogoncalves
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Cisco 2960-x doesn't ping default-gateway and creates duplicate packets

I need someone's help I have 3 Cisco 2960-X distribution switches stacked (1 master, 2 slaves), Once a week, our monitoring system alert us that the switch is down, until we reboot it. I ping/telnet the management interface (from the same VLAN). But…
benbelo
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Network Packets - Is the data always received sequentially?

Let's say you sit on your home computer and request https://google.com through your browser of choice. The TCP Handshake completes and google's server sends out the HTML/JS pages (and whatever other resources it uses). The pages are too large to…
Kellen Stuart
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Why iptables is not working as expected?

I have put these four filters with iptables: iptables -I FORWARD -p udp -i eth0 -j DROP iptables -I FORWARD -p udp -o eth0 -j DROP iptables -I INPUT -p udp -i eth0 -j DROP iptables -I OUTPUT -p udp -o eth0 -j DROP hoping to drop any udp packet on…
Bardia Zamanian
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Why are duplicated UDP packets being dropped 10 out of 11 times by this iptables configuration?

I am trying to duplicate UDP packets flowing to port 50007 on an Internet address from devices on a local NAT network (192.168.12.0/24) with the intent of processing them locally (on 192.168.12.1:50006). On 38 of my 40 devices, the following…
jonseymour
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How to connect Network and GRE Tunnel Traffic and control and flow of TCP/UDP Packets?

I need some serious help with a complex routing setup I am doing. Lets I have a /24 IPv4 .I am announcing the same /24 at two different locations. One is a ISP exchange center where all the ISPs peer each other locally.To make it simple just…
Rishabh Agnihotri
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How can I tell what's happening to my packets?

I'm trying to bring up a little box on my network. I just reflashed the firmware and it's supposed to come up as 192.168.1.1 by default. My router is a DSL modem at 192.168.0.1; it usually uses a netmask of 255.255.255.0, so I can't talk to the new…
Adam Bliss
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How to specify packets in traceroute?

I reading the manual pages for help, but I didn't find a parameter that allows you to specify how many packets to send with the program? Would appreciate tips from you guys, thanks!
blazonix
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Windows XP procedurally drop packets

We have a need in our office network to procedurally drop incoming packets on an Windows XP machine acting as a server. By procedurally we mean to drop a percentage of packets incoming to the XP machine from a specific IP address. Another option…
Mike
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