The network-protocols tag has no wiki summary.
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1answer
16 views
OSPF LSA Group Pacing
Is LSA group pacing enabled by default in Cisco IOS or something that needs to be configured under the OSPF process? How do you determine if it is currently enabled or not?
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1answer
25 views
Calculation units in EtherType frame field [closed]
The EterType ethernet frame field value is represent a payload field length in bits or bytes?
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0answers
35 views
Best protocol for finding a new computer to add to a network
What is the best protocol for finding an unknown computer through wireless communication?
The idea is that a computer starts off by itself and then broadcasts "Any other computer close enough to talk ...
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1answer
39 views
What decides what tunnels inside EAP-TTLS?
If EAP-TTLS is a EAP method that establishes a TLS tunnel, what goes in the tunnel? It could be another EAP method, but it could also be PAP. What decides? The server, the supplicant, or do they ...
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1answer
49 views
Services and protocols to restrict torrent traffic at a university campus [closed]
Which service has the ability of blocking bit-torrent traffic on a subnet network, snmp or bgp? Are these protocols useful for such blocking ?
1
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1answer
66 views
Packet Size modification over Sockets [closed]
I am doing socket programming in QT and I have to design a protocol to transfer DATA over TCP/IP.
Now my protocol design is SIMPLE and it sends commands in a fashion that the first BYTE of the data ...
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1answer
80 views
SQL Server Express cannot connect error: 28 - Server doesn't support requested protocol
I cannot connect to my local SQL Server Express (2012, but the version shouldn't matter) from my server (Windows 2008 R2) to use a tool on it (APEX SQL Data Diff if you are wondering). I can browse ...
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1answer
81 views
Which protocol do clients use when communicating with servers in a SAN [closed]
I'm trying to wrap my head around how a SAN works and how it is implemented.
If I understand this well, clients wanting to access the storage devices in a SAN need to communicate with the servers via ...
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1answer
183 views
Installing VPN servers that support PPTP, L2TP and openVPN protocols [closed]
Looking for VPN Server that support PPTP, L2TP and OpenVPN Protocols, also these servers must use the same data base so each account created on any of these servers must work across all the other ...
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0answers
65 views
How do private bittorrent trackers monitor ratio? [closed]
I'm trying to wrap my head around how torrent tracker servers work. How do private trackers monitor ratio?
I can see from the spec that there's a "completed" message, but I'm just not sure how the ...
1
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1answer
22 views
Bug in CDP implementation
We are developing a Linux based ethernet switch which has 6 ports. We are done with CDP protocol. I have connected a Cisco device to port 2. When I quiery for the Cisco device, I get the reply and ...
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2answers
1k views
IIS 7.5 Globe with Question Mark Icon
I changed the Physical Path to my website in IIS 7.5 and the icon changed to this:
It was completely vanilla before I changed that. I can't find any documentation on what that icon means and the ...
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1answer
256 views
Capturing network traffic (rtmp) between VMs or using loopback in the same VM using wireshark
I need to to capture RTMP traffic between two virtual machines (server and client) or atleast have the server and client on the same machine and capture the traffic. I am able to capture the traffic ...
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3answers
1k views
How to find all the snmp enabled devices in my network?
I want to find all the snmp enabled devices in my network, I got something like how it works in a agent and manager architecture.
I got net-snmp library to create a simple application to get the snmp ...
3
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3answers
176 views
identify a router that cuts certain port
Is there a way to identify which particular router between me and some server blocks connections on certain port?
I am in a hotel in Thailand, where they have recently changed some settings in their ...
1
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1answer
199 views
What was SPX from the IPX/SPX stack ever used for? [closed]
Been trying to learn about older networking protocols a bit, and figured that I would start with IPX/SPX. So I built two MS-DOS virtual machines in VirtualBox, and got IPX communications working ...
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3answers
177 views
Designing a persistent asynchronous TCP protocol
I have got a collection of web sites that need to send time-sensitive messages to host machines all over my metro area, each on its own generally dynamic IP. Until now, I have been doing this the way ...
1
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1answer
283 views
Nginx HTTP/SPDY over SCTP
I've ready a thread in russian Nginx maillist about implementing HTTP/SPDY over SCTP in future.
I realize that SCTP is completely unusable for public service at the moment, but what changes should ...
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2answers
142 views
What is the risk of opening network port?
What can someone do if i write a program to open a TCP port and run, lets say an echo server? Can some one access data on my system? or any other risk of opening port?
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1answer
1k views
Optimize OpenVPN connection?
This is a big headache for me for a few days now.
I having 2 servers on different location. We use OpenVPN to connect between the 2 servers.
Server1 has a Uplink of ~100mbps (OPENVPN Server)
...
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2answers
136 views
What is the point of PPPoE? [closed]
I am trying to expand my knowledge of networking beyond the basics. I have started reading about PPP, and how it is used in DSL modems with PPPoE and PPPoA.
My first impression of PPP was "well that ...
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0answers
191 views
Two IP ranges on eth1 configuration for centos 6.2
I have a dedicated server, with "Virtuozzo" on it running VPS's.
I have:
eth0 - which is configured to the internal network, that one is fine.
Now I have:
eth1 - which has two ranges routed through ...
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3answers
112 views
What transport protocols can be routed properly over the Internet, other than TCP and UDP?
I recently noticed that my ISP doesn't like routing native SCTP traffic over the Internet, unless it's tunnelled through UDP. A bit of a pain, but I solved the issue by using tunelling.
This issue ...
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6answers
227 views
Local Area Network (LAN) communication protocol
I'm a bit confused, and was wondering if someone can set me straight. Under a Local Area Network (LAN), what is the communication protocol for the data packets under i.e. ethernet CAT5 cable that ...
2
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2answers
326 views
How are CIFS and SMB related to each other?
Are they synonyms, or components of a protocol stack?
Answers with proof links are welcome.
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1answer
80 views
Concise set of rules for discarding DNS responses, or portion therein
Problem statement
It is possible for any name server on the internet to become "Authoritative" for legitimate, and illegitimate zones.
For example, I can add microsoft.com to my internal name ...
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2answers
229 views
Does cable length affects response time of ping?
The question is above.
Any link/idea is well appreciated.
My best regards...
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0answers
62 views
Adobe PDF Reader IE Plugins blocks some url
The client opens a pdf file on the corporate web page through the adobe pdf IE plugin to access a video tutorial file whose url resembles like this
mms://the/path/of/video/file.mwv
however, when ...
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3answers
89 views
DHCP DNS Setup for small network
I have a small network of 20 computers and 3 servers. I current have a Sonicwall firewall that does the DHCP for me. The question I have is the following.
On the DHCP settings should I have the local ...
11
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2answers
615 views
What's the protocol-level difference between IPSec and “Cisco IPSec”?
Most VPN clients distinguish between IPSec and "Cisco IPSec." For example, (Apple's) iOS treats them as essentially separate things.
But I can't find any explanation of what the protocol-level ...
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1answer
159 views
Manage the Win2008 routing table
I have a networking issue
As I have now two network cards and each one should connect to a specific network; one should be used to connect to the internet and the other one for intranet.
I want to ...
2
votes
2answers
102 views
Why PTP uses Sync-followup pairs?
The PTP (Precision Time Protocol), uses Sync message then Follow-up message, as described in the article "Understanding the IEEE 1588 Precision Time Protocol".
I don't understand why do we need ...
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4answers
1k views
If e-mail is only “best effort” delivery, is there a similar protocol with guaranteed delivery?
It's often established in law that faxes are accepted documents because their delivery is 'guaranteed', whereas e-mail is not because its delivery is not. Isn't this just begging for a TCP-based ...
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2answers
295 views
ICMP Reliability
Let's say someone sends a UDP packet, just like a traceroute implementations. The packet has a TTL of 1 in the IP header, causing the first router to discard it and generate an ICMP Time Exceeded ...
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2answers
48 views
UDP Protocol - ICMP Error Generation
I know that UDP has no real error control facilties outside of silent discard of packets failing checksums.
Am I correct in thinking that a UDP packet with a TTL=1 reaching a router will generate an ...
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2answers
232 views
(Simple) UDP Protocol - Networking
I know that UDP is an unreliable protocol where things can arrive out of order, fail to arrive completely, etc.
I'm also aware that when using UDP for something like traceroute, packets that arrive ...
1
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1answer
78 views
Remote desktop protocol implementation
I'm trying to find the best network solution for my own remote desktop application only for Windows (XP above) and I have the following requirements:
First of all, the application should work, let's ...
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1answer
166 views
Can a CISCO PIX tunnel SCTP traffic over an IPSEC tunnel
Can a cisco PIX 515e tunnel SCTP traffic over an IPSEC tunnel ?
I Know that the PIX doesn't support SCTP connection's but SCTP is still IP so i'm hoping the PIX has the capability to route SCTP over ...
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1answer
183 views
introduce latency between ec2 instances
I have a 2nodes Cassandra ring on ec2 (10.96.31.143, 10.254.94.177) in the same zone (east-1). How can I introduce a 3 seconds delay for all cassandra-related network communications between them? I ...
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3answers
965 views
Why does FTP use two ports [duplicate]
Possible Duplicate:
Why was the FTP protocol designed to use more than one port?
I know FTP uses two ports, one for commands and other for data transfer. Is there any specific reason or any ...
2
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3answers
693 views
What are the most common protocols on the internet? [closed]
For 69 views in the first day, 2 up-votes within 2 days, it's a shame that this was closed.
What are the commonly used protocols that sit atop TCP/IP and UDP/IP?
My list includes HTTP and ...
3
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3answers
720 views
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
118 views
How much and why may a windows domain controller affect performance of sql-server?
Excuse me by asking somehow vague. Please let me be more precise:
can anybody please explain me the networktraffic between sql-server and domain-controller on a installation following microsoft ...
3
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4answers
860 views
Ethernet switch capacity question
We're looking at hooking up 48 small embedded systems with 10/100 Ethernet ports to an Ethernet switch and then have that switch talk to a server upstream via a faster connection. I have a couple of ...
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2answers
326 views
Does intra-subnet traffic on a WLAN pass through a router?
Lets say I have two hosts, 1 and 2, both connected to the same wireless router, same network and same subnet.
If 1 pings 2 will:
(a) 1 addresses a wireless packet to the router's MAC address, but ...
0
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4answers
508 views
Redirect TCP connections from machine on internet to a machine behind a NAT
I would like to find a tool that allows me to do the following:
I have machine A behind a NAT\Router with a web application, then I have server B accessible on the internet.
Using some application all ...
2
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1answer
172 views
Confusion about TCP packet analysis terms
I'm analyzing our network and have some confusion about the terms:
this is the 2-packet output from source to destination.
from these i have to get some features as describe, pls make me clear...
...
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3answers
370 views
Ethernet: network topology
Consider a standard GigE network switch. In order to do the switching, presumably it needs to maintain a map of MAC addresses of all things that exist on the network to its (switch's) port numbers.
...
4
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1answer
116 views
How do IP address to location services gather their information
My continued series of questions on IP addresses (ref Q1 and Q2).
There are several IP address to location services. For instance: http://www.ip-adress.com/ip_tracer/ and ...
11
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5answers
430 views
Understand IP addresses and location
I risk posing an ill formed question here, but I'll give it a whirl.
Does it generally stand to reason that the nearer IP address A is to IP address B numerically, then the nearer IP address A is ...
