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1
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0answers
19 views

MAC Layer Retransmissions during the same TXOP

Back in the day I was messing around with MadWifi and, if I remember properly, after a packet was transmitted if the sender did not receive an ACK in SIFS time after the completion of the ...
11
votes
1answer
265 views

Under what circumstances is TCP-over-TCP performing significantly worse than TCP alone (2014)?

Many admins keep perpetuating - on ServerFault and elsewhere - how bad of an idea TCP-over-TCP is, e.g. in VPNs. That even the slightest packet loss will make one suffer from at least severe ...
0
votes
1answer
58 views

Worldwide IP Latency [closed]

I want to create a simulation of the protocol MIPv6 (http://www.ietf.org/rfc/rfc3775.txt), for this reason I need information about latency, jitter and round-trip time. My first guess is install ...
-2
votes
1answer
222 views

Configure Protocols using iptables log file with ndpi [closed]

I am using iptables with ndpi to filter my network and add two rules to my iptables rules they are iptables -I INPUT -m ndpi --http -j LOG iptables -I INPUT -m ndpi --google -j LOG In my log file ...
1
vote
2answers
245 views

What is the KRYPTOLAN protocol?

I've searched for a while and can't seem to find any information on what KRYPTOLAN is. For the transport layer, IP protocol number 0x41 is assigned. In addition, ports 398/udp and 398/tcp are also ...
0
votes
1answer
79 views

Token Ring Number of nodes in MAU [closed]

why the token ring has limitation of 260 nodes per MAU using STP cables? How the number of nodes per MAU is calculated? I know we can use more than 260, but why IEEE-802.5 is Standardized it to 260 ...
6
votes
1answer
121 views

Tools for detecting network traffic filtering [closed]

In Iran we have an ongoing problem with the govt. blocking and manipulating various network protocols. I'm looking for a tool, framework or platform to help us analyze and report on any of these ...
1
vote
0answers
19 views

Routing table taking long time to update for adhoc networks and OLSR

I am using OLSR to implement adhoc network and analyse the throughput.I have olsr working on 3 interconnected computers on adhoc network. I am using jperf to simulate and visualise the data ...
0
votes
1answer
213 views

How to get protocol signatures?

Does anyone know how can we get signatures for various protocols e.g. BGP, DHCP, VxLAN etc? By signatures, I actually mean the pattern (e.g. something like 0x234557888) used for pattern-matching in a ...
2
votes
3answers
137 views

Can i set 443 as default web port which means it can only be accessed via https and no port 80

As title says, I want to set my apache to listen on 443, and will configure SSL. So, My Question is :- 1). Does that mean, i will not have port 80 or any other port which is no ssl ? 2). My site ...
0
votes
1answer
266 views

Source and Destination Packets on Wireshark Relative or Absolute?

New in Packet Analysis. Sniffing on the Ethernet device of my computer. Does the Source and Destination columns on Wireshark tell the source and destination from where the packet was originated and ...
0
votes
1answer
24 views

How can i go ahead to configure two subnetted networks to apache so as to create two lone networks that are connected via switch?

I want to connect 15 systems to a server so that they do not communicate among themselves directly but do so via server, how should i go ahead? i need to allot say 5 systesm to HR people and 5 other ...
0
votes
2answers
117 views

Why does ipv6 not specify a protocol version?

I am relatively new to dealing with network packets, but as I look into the ipv6 header formats, I do not see a place where the ipv6 headers define what protocol is used in the data section -- but the ...
0
votes
1answer
53 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?
-1
votes
1answer
49 views

Calculation units in EtherType frame field [closed]

The EterType ethernet frame field value is represent a payload field length in bits or bytes?
0
votes
0answers
41 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 ...
0
votes
1answer
84 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 ...
-5
votes
1answer
82 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
vote
1answer
99 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 ...
0
votes
1answer
592 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 ...
-1
votes
1answer
129 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 ...
0
votes
1answer
323 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 ...
1
vote
1answer
38 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 ...
5
votes
2answers
8k 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 ...
0
votes
1answer
557 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 ...
2
votes
3answers
4k 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
votes
3answers
488 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
vote
1answer
399 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 ...
2
votes
3answers
301 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
vote
1answer
526 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 ...
0
votes
2answers
270 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?
0
votes
1answer
3k 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) ...
2
votes
2answers
172 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 ...
0
votes
3answers
142 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 ...
-1
votes
6answers
439 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 ...
3
votes
2answers
978 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.
0
votes
1answer
95 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 ...
2
votes
2answers
595 views

Does cable length affects response time of ping?

The question is above. Any link/idea is well appreciated. My best regards...
0
votes
3answers
100 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 ...
12
votes
2answers
894 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 ...
0
votes
1answer
191 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
300 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 ...
16
votes
5answers
2k 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 ...
4
votes
2answers
505 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 ...
0
votes
2answers
68 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 ...
1
vote
2answers
273 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
vote
1answer
91 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 ...
0
votes
1answer
252 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 ...
0
votes
1answer
246 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 ...
0
votes
3answers
2k 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 ...