Internet Protocol version 4 (IPv4) is the predominant OSI layer 3 protocol on the current Internet.
6
votes
1answer
63 views
Does SCTP work over the Internet?
I am working on an application that would be able to take advantage of the multi-streaming features of SCTP.
Does SCTP work across the Internet? Is it supported by ISP's routers and consumer routers ...
2
votes
2answers
89 views
How do the Application, Presentation and Session layers of the OSI model map to TCP/IP's Application Layer and vice versa?
I need to map TCP/IP protocols to the OSI model for some university test revision I am doing.
I was wondering if it is generally acceptable to assume any OSI Level 7, 6 and 5 protocol will be ...
-1
votes
1answer
77 views
Accurate approch for LAN Speed Test [closed]
Respected one,
Please guide me what would be the best approach to check the Network Speed(Uploading & Downloading Speed) within a LAN network (Which also have connectivity to Internet).
4
votes
4answers
267 views
/31 Point-to-point bitmasks
When is it appropriate to use a /31 network in production, and is using them considered good practice? On a point-to-point link, broadcasts shouldn't be required, so is there any compelling case for ...
10
votes
2answers
165 views
IPv4 Address Space Planning Best Practices
A recent question from Craig Constantine pertained to IPv6, but many people are not on the leading edge with IPv6 yet and are still responsible for new or improved IPv4 deployments.
I would like to ...
5
votes
2answers
140 views
Finding the IP of a MAC Address
Is there a way to derive the IP of a device from their MAC address on a Cisco device?
Assume you are not on a local segment where ping sweeping / arp are possible, instead you are remote and there ...
9
votes
3answers
129 views
Circular BGP propagation
This one is a difficult to describe, it's hypothetical because I'm learning about routing and right now I'm focused on BGP.
Let's say my ASN is 6500, and I announce 1.0.0.0/8. My peer, AS 6501 ...
1
vote
1answer
67 views
UDP Message Length Field and Pseudo Header
I'm learning some tcp/ip basics, and am having trouble understanding the Message Length field in UDP. In my book, it says that the Message Length represents the UDP header and data in octets, and ...
7
votes
3answers
244 views
VLAN and subnet relationship
Many have pointed out that a VLAN can hold one or more subnets. If your default gateway for this subnet is on a router or a L3 switch then how could there be more than one default gateway in a VLAN ...
12
votes
10answers
722 views
Difference between Subnet and VLAN?
You often hear the terms Subnet and VLAN used interchangeably. With the ubiquitous nature of IP these days, when are the two not considered roughly the same from a high-level, understanding that ...
6
votes
4answers
144 views
What is the use of wild card masks vs normal masks
I've always wondered what the use of wild card masks was. When I learned about them in college I wondered what the use was, we saw that you could separate subnets by for instance even and uneven IPs. ...
9
votes
4answers
241 views
How can I formulate the communication latency in TCP/IP?
I have difficulty in deriving a mathematical model/equation to estimate the round trip latency between two nodes communicating using TCP/IP. The nodes are exchanging data based on HTTP protocol. In ...
18
votes
8answers
2k views
How would a router with /32 WAN subnet mask communicate with the rest of the Internet?
I'm studying networking and one of the most basic things I've been told countless times is that computers can't communicate outside of their own subnet.
On the other hand, by looking at some ADSL ...
6
votes
4answers
125 views
IP prefixes by state (geolocation)
I've been given a task of creating several filters to block outside traffic by geolocation. In the list of the places that need to be blocked there are several countries (e.g. China and India) and 5 ...
-3
votes
0answers
64 views
The dns-server isn’t responding [closed]
I’ve built my test network with three computers: Windows 7 Ultimate, Windows 7 Enterprise and Windows XP. Each computer has a fixed IP-address. There are no error messages on the Windows XP computer, ...
9
votes
2answers
172 views
Why don't iperf, scamper and path MTU discovery packet captures agree on the path's MTU?
Let's do some path MTU discovery between two Debian hosts separated by a Debian router that runs Shorewall-generated iptables rules. Each of the two hosts uses a single Ethernet link while the router ...
3
votes
3answers
304 views
Migration from IPv4 to IPv6 strategies
As everyone is aware we are out of IPv4 addresses and soon (if not already) we shall be moving on to IPv6. What are some good strategies and practices to migrate a complete IPv4 network onto IPv6?
