How can the SO_RCVBUF be smaller than the TCP receive window? (Windows XP)

Posted by Tim on Stack Overflow See other posts from Stack Overflow or by Tim
Published on 2010-04-16T17:43:43Z Indexed on 2010/04/16 18:33 UTC
Read the original article Hit count: 125

Filed under:

tcp

|

windows-xp

|

sockets

|

winsock

I have an application using TCP on Windows XP. When I call getsockopt with the SO_RCVBUF option, it reports 8192 bytes. However, Wireshark shows the app advertising a receive buffer of 64K. How is this possible? To have a 64K receive window, doesn't it need a 64K buffer? Are there two different buffers?

© Stack Overflow or respective owner

Related posts about tcp

TCP RST Reset Every 5 Minutes on Windows 2003 sp2

as seen on Server Fault - Search for 'Server Fault'
Hey, Recently I had a web developer come to me and ask why he was receiving connection errors in his app that was accessing a sql database. So, I went through my normal trouble shooting steps to isolate or reproduce the issue. I discovered that if I connected to the database using Query Analyzer… >>> More
iptables issue on plesk

as seen on Server Fault - Search for 'Server Fault'
i don't know how to open a specific port (rtmp=1935) on my CentOS server using Plesk or itables. I created new rules for port 1935 i/o using Plesk/Modules/Firewall but this doesn't work. Nmap scanning tells me this : 1935/tcp filtered rtmp . So i decided to have look at my iptable using SSH (iptables… >>> More
Httpd problem, suspect an attack but not sure

as seen on Server Fault - Search for 'Server Fault'
On one of my servers when I type netstat -n I get a huge output, something like 400 entries for httpd. The bandwidth on the server isn't high, so I'm confused as to what's causing it. I'm suspecting an attack, but not sure. Intermittently, the web server will stop responding. When this happens… >>> More
Why can blocked IPs get through my iptables? What's wrong with this configuration?

as seen on Server Fault - Search for 'Server Fault'
(Why can/How are) blocked IPs (get/getting) through my iptables? Hello and thanks for your consideration... I have configured iptables and included (below) output from the command "iptables --line-numbers -n -L" yet IP addresses (like 31.41.219.180) from IP blocks I have already blocked are getting… >>> More
iptables syn flood countermeasure

as seen on Server Fault - Search for 'Server Fault'
I'm trying to adjust my iptables firewall to increase the security of my server, and I found something a bit problematic here : I have to set INPUT policy to ACCEPT and, in addition, to have a rule saying iptables -I INPUT -i eth0 -j ACCEPT. Here comes my script (launched manually for tests) : #… >>> More

Related posts about windows-xp

Windows XP - Security Update for Windows XP (KB923561) (KB946648) (KB956572) (KB958644)

as seen on Super User - Search for 'Super User'
My father's computer has Windows XP, but when I try to install the service packs it always fails. What gives? Here are the errors that I get in the event log: Date: 2/6/2010 Time: 12:02:18 AM Type: Error User: N/A Computer: EVO Source: Windows Update Agent Category: Installation Event ID: 20 Installation… >>> More
Restore Bak File created on Windows XP pro in Windows XP Pro 64

as seen on Super User - Search for 'Super User'
I have a situation that I need help with. I backed up my Files on Windows XP using the System BackUp utility/wizard, and then Installed a new operating system on the machine. Now I want to restore my old files via the .bak file but it is not being recognized at all. Did I do this wrong or is there… >>> More
Installed Ubuntu 12.04.01 with Windows XP but lost access to Windows XP

as seen on Ask Ubuntu - Search for 'Ask Ubuntu'
The First time I tried to install Ubuntu the installer installed it on my D drive. This resulted in only booting to Windows XP with no access to Ubuntu. I had to download a disk partitioning program to undo all of this. A tip from the Internet said to create a partition on the C drive for Ubuntu,… >>> More
Replace dual-XP installs with single-XP install and repartition drive?

as seen on Super User - Search for 'Super User'
Hello, The Current Situation I have a hard drive that currently is split up like so: Primary Partition C: 9.77 GB NTFS Healthy (System) with XP Pro (in Polish) installed Extended Partition D: 39.82 GB NTFS Healthy (Boot) with XP Pro (in English) installed … >>> More
How do I connect two computers with a LAN cabel?

as seen on Super User - Search for 'Super User'
I have two machines - Windows XP and a laptop using Windows 7. I connected them with a WLAN cable. On the Windows XP machine, I set the IP address to 192.168.0.10. On the Windows 7 laptop, I set the IP address to 192.168.0.20. The laptop can see the Windows XP machine, but Windows XP machine cannot… >>> More