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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How can I add more than 255 machines to a single Class C network? [duplicate]
Possible Duplicate:
How does Subnetting Work?
I'm mainly a programmer. I have no idea beyond some basic theory when it comes to Networking/Administrating.
My university feels that we ...
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5answers
986 views
What ports are least likely to be probed on the internet?
Suppose you've got a server that runs insecure software and you have to make it publicly accessible, what ports are "safest" for providing that service on the internet. By "safest" I mean least likely ...
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1answer
87 views
TCP/UDP Connection States documentation
Does anyone know where to find documentation for TCP/UDP connection states? Preferably non-Microsoft with unix backing.
Basically, I'm looking for more information about TCP established, TCP ...
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5answers
315 views
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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2answers
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What is the Ethernet Type II Protocol number for an ICMP echo request and reply?
Hi I wanted to know what the Ethernet II Protocol number for an ICMP echo request and also for a ICMP echo reply?
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3answers
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What is TCPIPv3
I have been reading at quite a few places about TCPIP v3 being out ...
I wanted to know what is this TCPIPv3 and what are differences between 2 and 3. I tried to google out the answer but could not ...
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6answers
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How to capture postscript output via TCP/IP? (for testing purposes)
We have a propriety system that talks to various printers across multiple sites via TCP/IP.
The system only outputs Postscript, which obviously sends via TCP/IP.
I'm really wondering is there any kind ...
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3answers
1k views
Is there any difference between prisoner.iana.org, blackhole-1.iana.org, and blackhole-2.iana.org?
Probably not the most useful question, but I'm curious:
I understand (in theory) that if a reverse lookup for a private IP makes it makes it past your own DNS servers you should get back ...
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2answers
368 views
DHCP IP address with a client specified DNS server? Is this against spec?
I have some embedded network devices that allow me to specify whether or not they use DHCP. Unfortunately, we have some clients that have less than stellar DNS servers in their networks and have ...
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6answers
2k views
Why am I getting long TCP connect latency on connect in a LAN (over a cross!)?
I am measuring a time of about 100-150 milliseconds from sending TCP SYN to getting SYN/ACK, between two linux computers connected to the same Cisco switch.
Consider:
The machines are very powerful, ...
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4answers
106 views
Smaller network packets vs bigger packets - confused
Some are saying that bigger packets are better to send then smaller.
But in this app: http://media.pearsoncmg.com/aw/aw_kurose_network_2/applets/message/messagesegmentation.html
The lower the packet ...
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2answers
248 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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2answers
93 views
Design for wire between server and access point and RF to endpoint device
We're about to design an inhouse industry network consisting basically of the following: 1 server connected via wire to up to 100 proprietary RF access points (basically embedded devices), which each ...
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3answers
625 views
Network device to change IP address within packets
I have an appliance with a class C IP address, for example 192.168.0.10. I can't or don't want to change this IP address. However when I connect this appliance to my network I want it to appear to ...
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2answers
376 views
I'm looking at sharing a printer over the internet, what are the implications?
Is it safe to NAT to the TCP/IP printer on the appropriate port in the router? Will I get unwanted documents from hackers or is this not a huge problem?
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2answers
6k views
TCP/IP packet loss network testing (in context of PingPlotter)
My question may be pretty basic TCP/IP / router based, but I need to couch it in terms of a Winpcap application pingplotter that I have used.
One of the features I did use in my last place of work ...
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1answer
68 views
Multi-IP server: how do programs know which IP to use?
I recently tried adding second IP address to our server for various reasons and found that now when I check netstat -anob there are many programs/services listening and establishing connections to ...
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1answer
146 views
multicast streaming, too much network traffic?
I am thinking of switching our streaming servers to use multicasting instead of registering multiple clients and duplicating the streams manually on the server. It seems to work very well. However, I ...
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1answer
203 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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2answers
2k views
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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3answers
416 views
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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4answers
136 views
Is asymmetric latency common in practice?
This is a follow-on to a question posted on stack overflow about whether it is possible to determine the one-way latency of a point to point connection without using externally synchronized clocks - ...
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2answers
79 views
How does VPN software 'hijack' packets for tunneling?
My current mental model
An application interacts with the operating system to produce an OSI model stack-based packet process - subsequent layers of encapsulation
Somewhere along the line before the ...
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2answers
92 views
Thousands of port 25 connections
Tonight a few IP addresses made almost 2500 connections on port 25 of a mail server. 2500 is the max limit, and 50 or less simultaneous connections is normal. They did nothing once they made the ...
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2answers
450 views
Problems with MDNS flooding on port 5353 UDP
I am running into a big issue at a small network i manage. This network is an Apple network, with airport extremes, expresses, mac book pro's, imac's, ipads, iphones etc...
I went to add something to ...
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1answer
200 views
Linux kernel 3 TCP IP tuning
I found several resources about tuning linux TCP/IP stack parameters in /etc/sysctl.conf for high bandwidth connections, but all refer to kernel 2.6.
Does anyone have suggestions about how to tune ...
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1answer
73 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 ...
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3answers
1k views
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 ...
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1answer
776 views
Analysing tcp packet reordering problems
Our site is connect to the internet by a pair of lines which currently have a significant difference in latency. We have a suspicion that when we enable 'downstream bonding' on these lines (i.e. our ...
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1answer
36 views
TCP/IP connection to SQL Express works on HALF of the clients in a WORKGROUP
So far I have learned the following facts about Microsoft SQL Server Express, including version 2012, and earlier versions like 2008R2, and 2008, and for the most part all the way back to SQL Server ...
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1answer
93 views
Way to do basic WAN optimization between two Linux servers that splits single connection into multiple parallel ones? [closed]
There are utilities on Linux that allow you to work around WAN conditions which cause you to not be able to utilize your full bandwidth. They do this by performing multiple requests in parallel (for ...
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2answers
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Why would a process be showing an outbound connection from a 169.254 address when there's no unconfigured adapter?
I have a system that has several network adapters, only one of which is enabled. That adapter has ipv4 only enabled and it has a single IP address. It was previously part of a team. The team was ...
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1answer
144 views
Can ranges overlap in ReservedPorts?
The value ReservedPorts in HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters contains a list of port ranges to reserve so the system won't assign them to programs dynamically.
...
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1answer
288 views
One Windows Domain workstation can ping gateway but gets no internet access
One of the (Windows XP SP3) workstations of our Windows Domain could not access internet anymore, this problem suddenly happened overnight. The domain controllers (there are three of them) are all ...
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1answer
342 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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2answers
651 views
How to optimize TCP / IP stack in Linux? [closed]
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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2answers
901 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 ...
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2answers
155 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 ...
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1answer
676 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 ...
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1answer
2k 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 ...
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1answer
184 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 ...
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1answer
246 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 ...
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1answer
152 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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1answer
57 views
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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2answers
1k views
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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3answers
2k views
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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1answer
560 views
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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2answers
280 views
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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1answer
431 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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1answer
675 views
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 ...
