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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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 ...
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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 ...
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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?
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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 ...
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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 ...
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243 views

How to do MAC based one to one NAT on Linux?

I have a linux machine running ubuntu server with 2NICS (WAN and LAN). I want the LAN side machines to use the linux box as a gateway to get on the internet (WAN side). The only problem is that the ...
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Windows Server 2008 R2 IP Address Binding order

How do I set the order of multiple IP addresses all bound to one ethernet interface?
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Specifying a preferred route when there are multiple links to same network

I have a server with multiple interfaces and IP addresses on the same network. I would like for non-iSCSI traffic to exclusively use one of the interfaces, and for iSCSI traffic to exclusively use the ...
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167 views

What is maximum traffic of data that can pass through a coproprate intranet in a day? [closed]

Can someone please tell how many maximum terabytes of user data can be passed in a day in a data migration application involving both client and servers on the same intranet, assuming that network is ...
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Connecting to a Windows server that has an active VPN connection

In my company we connect to various customers using VPN. We have a dedicated Windows server where the VPN clients are installed, and if we need to do customer support, we have to physically log in to ...
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open tcp/ip conenctions count is around 2.1 million!

There are around 1500-2000 users online on this win2008 r2 server on around 50 sites. performance monitor reports around 2.1 million active ip4 conenctions. server is ip6 enabled and has public ip6. ...
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Accidentally set .255 IP address - how can I ssh to the machine?

A server's static IP address got set to x.x.x.255 on a Windows network, but apparently .255 addresses are broadcast addresses to windows. So now I can't connect to the box from my Windows machine. ...
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292 views

Isolating one router port from the rest

I don't know much about TCP/IP and what I'm trying to do seems fairly basic to me but I can't seem to figure it out. I have one central router connecting to my ISP, and all computers connected to ...
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How is the MTU is 65535 in UDP but ethernet does not allow frame size more than 1500 bytes

I am using a fast ethernet of 100 Mbps, whose frame size is less than 1500 bytes (1472 bytes for payload as per my textbook). In that, I was able to send and receive a UDP packet of message size 65507 ...
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1answer
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Is it possible to disable ARP in Windows 7

I have a unique requirement where I need to disable ARP on a Windows 7 box. In previous Windows versions you could modify the ArpRetryCount in the registry (and set it to 0), but this does not work in ...
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729 views

Windows 2008 TCP Performance

Some background... I am currently building a domain drop catch application using C#. It uses a single Socket, which sends data through an SslStream. I have spent weeks on the app and I am 100% sure ...
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Lots of TIME_WAIT connections in netstat (Windows Server 2008)

I'm having some issues on a Windows 2008 server with some network connections not going through. For instance, in a web application on the server, we need to open a socket connection to another ...
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Answering on the same interface where the request came from

First, I know this is not how IP is intended. But as usual, this is how I need to have it working. I work for a security company. There are at least 2 network interfaces. Both interfaces should have ...
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373 views

Re-Configuring TCP IP of an AIX system ( LPAR P770/AIX 5.3)

I have serverA and serverB (AIX LPARS on SystemP) I want to switch hostname and IP configurations between serverA and serverB. Is it enough to perform the changes via smitty mktcpip or do I have to ...
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316 views

What is a RP Paket in a tcpdump log?

I have a tcpdump log with the following entry: 14:53:31.428570 IP 10.4.65.65.16666 > 192.168.201.10.80: RP 587:687(100) ack 48545454154 win 0 My Problem is that i have never seen an RP paket ...
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3answers
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Routing a PPTP client and VMware Server instance running on the same box

I have a Windows 2003 SBS box. It has 2 physical NIC's: WAN and LAN. The WAN is a public IP. The LAN is a simple 192.168.2.x subnet with Microsoft DHCP Server. Microsoft Routing and Remote Access ...
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Windows Server 2008R2 - can't change or remove the default gateway

We've installed VMWare Server 2.0 on Windows 2008R2. After some time playing with it (actually only removing host-only and nat networks, and binding adapters to the specified vmnets) we've noticed a ...
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ping problem from a single host

I've a host 10.10.10.1 which i can ping from other machine but ping was sudden stopped from nms machine where the above IP is being monitored 24/7. any help? It has being to work so now i'm unable ...
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Is there a limit to how many sites can be hosted on a single IP address when using HTTP Host Headers on Windows 2008?

For reasons that are lost in the mists of time, our older Windows (2000, 2003) servers have been configured with a "Administrative" IP address and three further "Hosting" IP addresses. There are also ...
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TCP/IP communication between Hyper-V host and guests

This may be a simple one. :) I have a simple Hyper-V setup with a few guest os running. The host has 1 physical network adapter with a static IP assigned to it. The guests have network adapters ...
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Retrieve a domain name based on an IP Address?

I'm reviewing some apache logs, specifically with respect to downloaded files. I'm interested in knowing, if possible, which domain is responsible for the download, given an IP address. I've given ...
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Latency in TCP/IP-over-Ethernet networks

What resources (books, Web pages etc) would you recommend that: explain the causes of latency in TCP/IP-over-Ethernet networks; mention tools for looking out for things that cause latency (e.g. ...
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What makes SSH so resilient with regards to connectivity issues?

I've rebooted the office's WiFi router and, as expected, my laptop disconnects. Once I reconnect, I notice that my SSH session never dropped. What about the SSH protocol makes this possible? Or does ...
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Where do ack-only sent packets come from (on FreeBSD)?

I run the systat -tcp command on a moderately loaded system and see something like this for a 5 second window: /0 /1 /2 /3 /4 /5 /6 /7 /8 /9 /10 Load Average ...
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Why does disabling the TCP/IP NetBIOS Helper service lock me out of GPO?

I disabled TCP/IP NetBIOS Helper and started getting EventIDs 1030 and 1058. This thread said that I'd need to have it enabled. Indeed, when I started it up, the problem immediately went away. My ...
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TCP/IP Printing Issue in Windows Server 2008

I am running Windows Server 2008 R2 Entrprise in a VM on my laptop. I am having problems setting up a printer. It's an HP PSC 1355 - drivers were installed automatically when I plugged the device into ...
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Help me understand Public/Private IP space and NAT

I just started working at a small-medium sized business after graduating school. So much of my knowledge is high level concepts without a lot of hands on. My understanding that according to rfc1918 ...
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How to cap network traffic using TCP/IP settings in Windows 7?

Is it possible to cap network traffic on a Windows 7 system so that it will not exceed a given throughput value? The BitTorrent client uTorrent is able to do this, but I am guessing that it's doing ...
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Networking security and TCP/IP internals books/sites

I am searching for good books and articles about TCP/IP, mainly the security aspects of TCP/IP protocols. I have TCP/IP Illustrated and the TCP Guide, but they kinda lack on description of 'classic' ...
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Why does the W2k3 TCP/IP stack gets corrupted?

I have a W2K3 server that every time an update restart the server, at boot the tcp/ip stack gets corrupted. This makes the server unable to do any kind of networking, and when i issue an ipconfig ...
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IIS7 hundreds of connections in CLOSE_WAIT

I have a .Net application on my IIS7 server it was working fine until I had to move it to another server. I moved the exact same code to the new server and I noticed that after some hours the ...
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Where did TCP/IP Filtering go in Windows Server 2008?

I'm configuring our new Windows Server 2008 machine. In Windows Server 2003 we would enable TCP/IP Filtering on our network cards to only allow traffic on specific ports to get through. This was ...
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Unix socket vs TCP/IP host:port

Could someone please describe to me the pros and cons of using a Unix socket file vs a tcp/ip localhost:port when setting up services on a server (Ubuntu, FWIW)? In this particular instance it's for ...
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Can't connect using TCP though UDP/ICMP works

My office changed IP addresses yesterday and since then we can't access any site hosted by mediatemple.net plus a couple of other sites. The office connection is ADSL (PPPoA). Both MT and my ISP ...
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No transmission via IP

I'm using netstat on Win XP to check protocol transmission details for TCP, IP, and ICMP. There is transmission only in TCP. No transmission in ICMP is understandable since it's for errors and I ...
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Which is the default TCP connect timeout in Windows?

Which is the default TCP connect timeout in Windows? There is a registry key to configure it or it's set dynamically?
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capture traffic between boards at PC using wireshark

I have two board connected using ethernet interface by means of switch. I have a linux machine connected to the switch where I run wireshark. I assign same IP address range for both boards and the ...
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Windows Server 2008 R2 DNS Server not working?

I have a server running Windows Server 2008 R2 hosting a DNS server, exchange 2010 and is a domain controller. One computer on the network (and domain) can ping the server 25% of the time, also when I ...
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470 views

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? ...
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How works tcp/ip package transport inside Linux OS? [closed]

How works tcp/ip package transport inside Linux OS?
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1answer
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Maximum number of TCP clients in Windows 7?

I am running client load testing software for my server from a Windows 7 Enterprise box. The client box is able to get up to 16346 TCP connections out, and then it starts giving the error “An ...
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Is it possible to configure Nginx to send TCP keepalive?

On TCP connections held by NGinx, can it be configured to send TCP Keepalive (Not HTTP KeepAlive!)
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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 ...
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Windows XP/7: custom routing for VPN connection

We are dealing with a badly configured VPN connection from a vendor, which set up the default gateway but doesn't route traffic anywhere beyond their VPN zone. I managed to do some ad-hoc routing to ...
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TIME_WAIT consumes file descriptors?

In many TCPIP and Web tunning guide, recommends increasing max number of file descriptors when getting the error "Too many open files" but, i can't see TIME_WAIT in outputs of "lsof -i" Does anyone ...