The tcpip tag has no wiki summary.
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0answers
50 views
Maximum throughput of a TCP connection: calculation and measurement [closed]
What is the formula for calculating the theoretical maximum throughput of a TCP/IP connection between a sender and a receiver, assuming that one knows the TCP transmit window size, round-trip time, ...
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2answers
41 views
TCP and Ports Connection
Can more than 1 TCP connection be active at the same time between the two ports on two different host? Please answer.
2
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0answers
41 views
TCP/IP performance tuning under KVM/Qemu
With more and more companies switching to public cloud services, I'm curious what you guys' thoughts are on TCP/IP tuning in the cloud. Is it worth bothering with? Given that you don't have access to ...
0
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0answers
6 views
Windows 7 does not give a warning when subnet on a network with DHCP conflicts with one of the existing static subnets on another adapter [migrated]
On the client-side, i have a loopback adapter at 192.168.1.1, with a 255.255.255.0 mask. I also have a wireless connection that does not work when the loopback adapter is enabled. Would it make ...
2
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2answers
79 views
How do I prevent excessive ARP requests sent from Windows Server 2003?
OK, I've scoured the 'net already for possible solutions and have found none. Maybe you guys can help me.
I have a Windows Server 2003 setup, with a fixed IP on a routed LAN, standard /24 network.
...
0
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1answer
45 views
PC can't log into SQL Server on different peer network
I have a basic peer network (WORKGROUP) with PCs connected to sql server 2008 on a Windows 7 machine. I took one XP pc and the server home and connected to the server with no problems. When I plugged ...
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1answer
74 views
From TCP/IP network to IPX/SPX network? [closed]
Ok so can a computer from a TCP/IP network communicate with a computer from a IPX/SPX network? If so how will the routers handle the addressing scheme? And what if i wanna telnet that computer from ...
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0answers
63 views
How to change outgoing IP address for windows 2008 r2 server?
I have the following issue on my windows2008r2 server with this hotfix (http://support.microsoft.com/kb/2554859),
server has several IPs set to the one NIC, for example 1.1.1.1-1.1.1.5
By default for ...
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1answer
49 views
Where is a TCP/IP connection established?
When a TCP/IP Connection is established, is all handled at the network interface (NIC) level or does it also hit the OS kernel?
If so, is it expensive to the CPU (in terms of CPU cycles)?
3
votes
4answers
89 views
Determining cause of TCP/IP connect issue without traceroute
I'm trying to connect from a company network to a host (via HTTPS), but my attempts fail with timeout. I can resolve the host. I know the host is up. I know there is a firewall filtering by incoming ...
0
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0answers
51 views
How to inspect a socket's traffic class on Solaris
You get a bit of information about socket options with pfiles, for example
93: S_IFSOCK mode:0666 dev:344,0 ino:48867 uid:0 gid:0 size:0
O_RDWR|O_NONBLOCK
SOCK_STREAM
...
1
vote
1answer
140 views
How to optimize TCP / IP stack in Linux?
Currently I noticed there are about 15K open connections to localhost. It is mainly connecting to Memcached. I am clueless where I should start to optimize TCP/IP stack. Memcached support UDP, but ...
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0answers
82 views
Server 2003 - Cannot ping “unable to initialize sockets interface, error code 0”
I recently restored a Hyper-V backup for my 2003 server VM. Everything seems to be working but I cannot establish network connections. I am getting an error on ping "unable to initialize sockets ...
0
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1answer
34 views
Maintaining same TCP session, load balacing
With http live streaming (HLS) we need to deliver video segments one after other to the player to play them in a continuous fashion. Segments are present on many streaming servers and we would load ...
0
votes
2answers
155 views
why is TCP Connection state not changing from CLOSE_WAIT to CLOSED?
I have a client server application running in:
Server: Windows server 2008 R2 [Standard]
Client: Windows XP SP3
Workflow:
Server listens for client connections at port YY.
Client connects to server ...
0
votes
1answer
83 views
Windows 2008 blocked TCP connection
I have a strange problem that I don't know how to diagnose:
I have a small test application that tries to make a socket connection to an RTU on port 5001 (can't change this). The application works ...
6
votes
3answers
274 views
Where is the documentation that states TCP and UDP source port should be over 1024 and random?
I am having a hard time to find where it is documented that the source port should be random and in the range 1024-65535.
In which RFC is this documented?
Edit:
First reference for privileged ports ...
0
votes
1answer
93 views
Detecting TCP/IP connection drop issues in my application
I have a desktop application which talks to a server using TCP/IP. It was working before but now we are running into an issue. The log message on the server shows that the socket is disconnected after ...
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1answer
124 views
How does tcp keep a connection alive? [closed]
In http ( over tcp) there is a header which called keep "alive"
I dont understand how a connection can be open in tcp if all packets come from different
source ( router decision - over the internet)
...
1
vote
1answer
72 views
Multiple Homed Windows 2008 Server / Windows 7 Client
I have a small Windows 2008 network, with some Windows 7 clients. The clients are both laptops with docking stations and I would like them to communicate with the Windows 2008 server (for filesharing) ...
1
vote
1answer
44 views
Nmap reporting incorrect results from an idle scan
I have a VPS that I was scanning to make sure everything is in check. A regular SYN scan reports that ports 25 and 80 are open (which they should be). When I run an idle scan however, I get back that ...
0
votes
1answer
51 views
How to track down a Windows 7 networking problem
In my attempts to make a remote controlling a Windows 7 x64 machine perform better, it appears that I made things MUCH worse. Problem is, I undid all the changes I had made and the computer still ...
2
votes
1answer
184 views
Concerned about the content of ip_conntrack
Summary
Server OS: Debian Squeeze
Web Server: Apache2
IP Tables 'script': arno-iptables-firewall
There are 170 entries in /proc/net/ip_conntrack on the server. At present, 134 of those relate to ...
1
vote
1answer
94 views
Why won't sql server express 2008 service restart after I enable TCP/IP Protocol?
Whenever I enable TCP/IP connections on my SQL Server Express 2008 database server running on Windows XP SP3, I cannot restart the service, it simply states "The request failed or did respond in a ...
2
votes
1answer
96 views
Issues changing netmask from /24 to /22 on local network
We currently have a network, 192.168.1.0/24. We are close to being out of numbers.
If we change the netmask on our servers to /22 (255.255.252.0) all equipment (hosts) with 192.168.1.xx/24 will still ...
1
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2answers
67 views
Multiple systems with the same IP/subnet
Given multiple systems (embedded devices) on a LAN with a factory-set default IP of 192.168.1.1/255.255.255.0, is it possible to communicate with them using UDP broadcast and to receive an answer for ...
0
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0answers
35 views
connection monitoring application
Could you advise me some tool that allows to see traffic speed per connection? I have found currports tool, it's nice, but it doesn't show speed. Also I use Outpost Firewall for this purpose, but it ...
2
votes
2answers
140 views
What do all the settings in the Advanced TCP/IP Properties DNS Tab Mean?
Can someone explain TCT/IP > Properties > Advanced > 'DNS' tab please?
I know what DNS, primary DNS suffix and DNS suffix are, but this tab has some confusing properties.
3
votes
2answers
268 views
How do I set up IP over FC?
I have 2 systems, with a Broadcom BCM5701 and a LSI7202p, of which are connected with a LC->SC cable. The cards are properly detected in Linux, however I wish to set up IP over FC. I've read online ...
0
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2answers
61 views
how to implement elastic ip like architecture in private server farm
what are the ways by which I can implement elastic ip like architecture in my private server farm?
There is only one global ip available but I should be able to ssh any server from external network by ...
3
votes
1answer
37 views
Machine cannot communicate on local network any more
I have a machine that has a problem I've never seen and cannot understand.
The machine is a Dell laptop with Windows 7 Ultimate. The user tried to do something fancy with this machine (bridging the ...
1
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2answers
81 views
Solaris VM Experiencing Frequent Timeouts
We are having an issue with all of our Solaris VMs. The issue we're seeing is frequent timeouts when when connecting via SSH or HTTP. It only seems to affect initial connections... when I connect via ...
3
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3answers
336 views
Backups take so long that the firewall closes the connection
A bit of a mashup of systems here, so bear with me. Essentially, I'm having some trouble using the Backup Exec agent for Oracle, while trying to backup a remote Linux server. The BE agent appears to ...
0
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1answer
47 views
connection established, waiting
I work for some administration. We are responsible for app development, I'm personnaly responsible for the software application servers (Glassfish) and there is a team which manages the infrastructure ...
0
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1answer
205 views
Trying to get DNS services running on Windows Server 2008 R2, what am I getting wrong?
Ok, So I am basically trying to get a home server pc up that will provide Domain name services, act as Mail server and web server. I have one static IP, well it's not officially static but hasn't ...
4
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1answer
142 views
Behaviour of solaris tcp stack with relatively high RTT and bursty traffic
I have an application that is distributing data from New York to Tokyo over TCP running Solaris 10. Mean throughput is < 1Mbps, peak throughput can reach 20-30Mbps for seconds at a time though ...
1
vote
1answer
366 views
OpenVPN and TomatoVPN
Wondering if someone can help me with the following.
I have updated my Linksys router with TomatoVPN and used the following config:
Interface Type:TAP
Protocol:UDP
Port:1195
Firewall Custom
...
2
votes
4answers
126 views
How can i measure the load of a WAN Connection with Wireshark?
I have a 100 Mbit WAN connection and want to check the load on it for a week.
So I put a hub (10/100Mbit) behind the WAN connection and connected a laptop with wireshark on it. Here is now my ...
1
vote
1answer
85 views
Users from my ISP's IP range can't hear my radio stream but others can
I'm streaming a radio via Shoutcast server from a PC in my office and ppl from around the world can hear it in browser or via wmedialayer/winamp, but people from my ISP (including me when I use outer ...
7
votes
3answers
373 views
How are IP addresses actually assigned?
I'm having a hard time understanding how a governing body assigns IP addresses, companies use BGP to advertise those IPs, and how the internet works. Then, where the hell does DNS come in?
Can ...
2
votes
1answer
62 views
Can a TIME_WAIT connection be restored?
Is it possible to restore a connection that is in state TIME_WAIT?
If not, I use raw packets (forgering the source), is it possible?
(Please understand that I do not intend to do bad things, it's ...
23
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10answers
1k views
Why would you use IPv6 internally?
Of course, I realize the need to go to IPv6 out on the open Internet since we are running out of addresses, but I really don't understand why there is any need to use it on an internal network. I have ...
3
votes
1answer
143 views
different ACK behaviors (slowing down throughput?)
I'm running netio (http://freshmeat.net/projects/netio/) on one machine (opensolaris) and contacting two different Linux machines (both on 2.6.18-128.el5 ), machine A and machine B.
Machine A has a ...
1
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2answers
197 views
What does this output from HPing mean?
hping command: hping3 -G --rroute $domain -i u1000
Result:
len=80 ip=127.0.0.1 ttl=64 DF id=0 sport=0 flags=RA seq=176 win=0 rtt=0.2 ms
(same route)
len=80 ip=127.0.0.1 ttl=64 DF id=0 sport=0 ...
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0answers
76 views
Two Sql Servers 2008 R2 Express running on one machine
I've installed two SQL Server 2008 R2 Express versions on one Windows 2008 R2 Enterprise system. Everything worked fine till today as now one instance doesn't want to get up.
Basically it's ...
0
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1answer
764 views
Good packet generator tool for IPv6.. Does hping3 support IPv6?
Does anyone of you know any good packet generator tool for IPv6. I am very familiar with hping3, but don't know if it supports IPv6.
I am looking for something which can send, tcp, udp, icmp, and ...
0
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1answer
98 views
Building test environment inside Hyper-V - Adding machines into a Domain
I am currently building a test environment with 4 servers inside Hyper-V.
One of the servers is a Domain Controller, the other servers will be a member of that domain.
All machines are on an ...
1
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4answers
103 views
About the link layer of TCP/IP
I know there're ethernet,token ring,FDDI ,etc protocat the link layer,
but how to know the exact protocol used to perform a specific task,like browsing a web page?
0
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1answer
130 views
Variable port forwarding dependant of iptables rules
I want to setup a special SMTP environment: two different SMTP servers that should be transparently accessed from SMTP clients.
Let's say I have a RFC compliant Postfix running at 192.168.0.1:25 and ...
1
vote
1answer
175 views
Changing TCP/IP IPID sequence generation algorithm on Windows Server
a recent security review on a customers webserver yielded the following results:
"[...]
The system under test is using incremental ip ids.
This means that every outgoing ip packet has an ...
