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Questions tagged [tcpip]

TCP and IP are two important protocols used in networking today. Due to their importance, the Internet Protocol Suite is also commonly known as "TCP/IP"

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Linux TCP stack and network cards performance: packets per minute before drop?

how much TCP packets should come at 100/1000mbit network card (not an embedded Realtek's home solution) before the Linux kernel will become unable to process the NIC's buffer resulting in packet drop? Hardware: let's say about dual-core Xeon +…
kagali-san
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Slow and fluctuating server network speeds in a new data center

We have a server running Windows storage server 2003 with: - an FTP server and - VMware Server running a VDS with apache (vds runs windows web 2003) This is in a data center and we just switched to a new network provider. Before the switch, things…
Samuel
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Need help getting StateServer to work, trying to decipher WireShark to figure out why

I'm using WireShark to try to figure out why I can't get my ASP.NET application (which is deployed to IIS6) to use a remote ASP.NET StateServer. For the record, StateServer works if my application is deployed to the same machine as the…
DaveDev
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Linux TCP connection timeout length inconsistent

On the Linux boxes that host the application I work on, we've started seeing an issue where connection attempts against a port on a remote host are sometimes taking longer to come back. As a test, a simple script was set up that just tries to telnet…
bcasp
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Network Speed Limit

I have a nic "Local Network" and I would like to limit throughput speed for it to 1480kb/s and 208kb/s upload How can I do that?
DanSpd
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Detect and aggregate packets sent to server per TCP port

Is there a way with Ubuntu 10.4LTS to detect and aggregate the number of packets transmitted over every port? In other words, I'd like a process to keep track of the number of packets sent to each TCP port (whether or not a connection is…
Brian M. Hunt
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xt_TCPMSS: bad length messages

I'm getting loads of messages like: Jun 23 10:24:20 awakening kernel: [ 1691.596823] xt_TCPMSS: bad length (1492 bytes) Jun 23 10:24:21 awakening kernel: [ 1692.663362] xt_TCPMSS: bad length (1448 bytes) Jun 23 10:24:21 awakening kernel: […
Matic
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Cannot ping host stale ARP cache?

I am having a strange issue with a Debian (Lenny/Linux 2.6.26-2-amd64) that has been driving me nuts. On some machines within my network I can ping the host in question just fine, other times I have to manually hard-code the ARP ethernet address…
Gordon Knoppe
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How to enable TCP Vegas on Centos 5.4?

I'm trying to enable TCP Vegas congestion control on Centos 5.4 box. According to Vegas home page it is as simple as echo 1 > /proc/sys/net/ipv4/tcp_vegas_cong_avoid but this file does not exist. I found kernel module…
jackhab
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Change DHCP range and tcpip connections

I want to change the dynamic range of my DHCP server for a network e.g. it is at the moment from 192.168.0.2 to 192.168.0.100 I want to move it from 192.168.0.101 to 192.168.0.200 but I don't want to break the connections/sessions. If I have dnsmasq…
AAB
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Iptables rule to capture DHCP I/O fails

I have stumbled upon a peculiar issue with Iptables. I am not seeking a solution to a problem, but an explanation of some strange behaviour of iptables. My platform is Ubuntu 22.04.2 LTS with 5.19.0-43-generic kernel, using a wireless interface…
storestyggeulv
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Periodic Disconnection with DHCP DISCOVER

LAYOUT 192.168.0.103(THE ONE LOSES THE CONNECTION - WIRESHARK CAPTURE) 192.168.0.84(THE ONE WORKS PROPERLY - WIRESHARK CAPTURE) We have an app that receives data from one of our devices. We installed our receiver app to both…
Batuhan Zorlu
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Continuous [ACK]Packets Without any Response From Receiver

Our application sends some data to one of our devices via TCP/IP, However communication in between not working as it should be.Because TCP/IP is bidirectional, so if one side sends data to other, other sends ACK flag. CAPTURE As it seen in the…
Batuhan Zorlu
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How to find out if TCP connection to server is being tampered with by third-parties?

I'm under an unreliable ISP/AS, something like the GFW. They actively try to sabotage a TCP+TLS session by attacks such as sending SYN RST to established connections, making the connection timeout, messing with handshaking etc. Is there a utility in…
Ragahito
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How can I connect two routers to the same switch

First of all, I'm not talking about those all-in-one routers that do wifi/switching/routing. It drives me nuts when people call a Wifi box a "router". Anway, I would like to do the following as shown in my diagram: Is it possible to connect Router…
7wp
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