The document discusses several network protocols:
- Address Resolution Protocol (ARP) is used to map IP addresses to MAC addresses on local networks. It broadcasts requests and unicasts replies.
- Reverse Address Resolution Protocol (RARP) is used to find logical addresses for physical addresses.
- Dynamic Host Configuration Protocol (DHCP) is used by hosts to automatically obtain IP addresses and other network configuration when joining a network. It provides both static and dynamic address allocation.
This ppt contains what is dhcp, it's need, advantages, disadvantages, IP address assignment process and types, DHCP architecture and lastly some differences.
This ppt contains what is dhcp, it's need, advantages, disadvantages, IP address assignment process and types, DHCP architecture and lastly some differences.
How do we get datagrams to the right physical host?
Tricky part comes when a router is forwarding to a LAN with multiple hosts (which is typically the case)
IP datagrams contain an IP address
Configured in OS
NIC’s only understand addressing of their particular network
Ethernet’s 48 bit MAC addresses
How to Position Your Globus Data Portal for Success Ten Good PracticesGlobus
Science gateways allow science and engineering communities to access shared data, software, computing services, and instruments. Science gateways have gained a lot of traction in the last twenty years, as evidenced by projects such as the Science Gateways Community Institute (SGCI) and the Center of Excellence on Science Gateways (SGX3) in the US, The Australian Research Data Commons (ARDC) and its platforms in Australia, and the projects around Virtual Research Environments in Europe. A few mature frameworks have evolved with their different strengths and foci and have been taken up by a larger community such as the Globus Data Portal, Hubzero, Tapis, and Galaxy. However, even when gateways are built on successful frameworks, they continue to face the challenges of ongoing maintenance costs and how to meet the ever-expanding needs of the community they serve with enhanced features. It is not uncommon that gateways with compelling use cases are nonetheless unable to get past the prototype phase and become a full production service, or if they do, they don't survive more than a couple of years. While there is no guaranteed pathway to success, it seems likely that for any gateway there is a need for a strong community and/or solid funding streams to create and sustain its success. With over twenty years of examples to draw from, this presentation goes into detail for ten factors common to successful and enduring gateways that effectively serve as best practices for any new or developing gateway.
How do we get datagrams to the right physical host?
Tricky part comes when a router is forwarding to a LAN with multiple hosts (which is typically the case)
IP datagrams contain an IP address
Configured in OS
NIC’s only understand addressing of their particular network
Ethernet’s 48 bit MAC addresses
How to Position Your Globus Data Portal for Success Ten Good PracticesGlobus
Science gateways allow science and engineering communities to access shared data, software, computing services, and instruments. Science gateways have gained a lot of traction in the last twenty years, as evidenced by projects such as the Science Gateways Community Institute (SGCI) and the Center of Excellence on Science Gateways (SGX3) in the US, The Australian Research Data Commons (ARDC) and its platforms in Australia, and the projects around Virtual Research Environments in Europe. A few mature frameworks have evolved with their different strengths and foci and have been taken up by a larger community such as the Globus Data Portal, Hubzero, Tapis, and Galaxy. However, even when gateways are built on successful frameworks, they continue to face the challenges of ongoing maintenance costs and how to meet the ever-expanding needs of the community they serve with enhanced features. It is not uncommon that gateways with compelling use cases are nonetheless unable to get past the prototype phase and become a full production service, or if they do, they don't survive more than a couple of years. While there is no guaranteed pathway to success, it seems likely that for any gateway there is a need for a strong community and/or solid funding streams to create and sustain its success. With over twenty years of examples to draw from, this presentation goes into detail for ten factors common to successful and enduring gateways that effectively serve as best practices for any new or developing gateway.
OpenFOAM solver for Helmholtz equation, helmholtzFoam / helmholtzBubbleFoamtakuyayamamoto1800
In this slide, we show the simulation example and the way to compile this solver.
In this solver, the Helmholtz equation can be solved by helmholtzFoam. Also, the Helmholtz equation with uniformly dispersed bubbles can be simulated by helmholtzBubbleFoam.
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Quarkus Hidden and Forbidden ExtensionsMax Andersen
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In this presentation we will share our experiences around getting started with the Globus Compute multi-user endpoint. Working with the Pharmacology group at the University of Auckland, we have previously written an application using Globus Compute that can offload computationally expensive steps in the researcher's workflows, which they wish to manage from their familiar Windows environments, onto the NeSI (New Zealand eScience Infrastructure) cluster. Some of the challenges we have encountered were that each researcher had to set up and manage their own single-user globus compute endpoint and that the workloads had varying resource requirements (CPUs, memory and wall time) between different runs. We hope that the multi-user endpoint will help to address these challenges and share an update on our progress here.
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6. ARP Operation
• APR broadcast the IP address of a host to all
the system in the network.
• When the host IP in the network identifies
that its own IP address then the specific host
unicast its MAC address as reply to the header.
7. ARP Operation
• Now the sender has the source IP address,
source MAC address, Destination IP address,
Destination MAC address.
• It updates its table with destination IP and
received MAC address and then sends the
data to the destination.
12. Dynamic Host Configuration Protocol
• It is a protocol used by a host, as it boots, to
learn different information about network,
such as its IP address.
• The DHCP provides booth static and dynamic
address allocation that can be manual or
automatic.
13. Dynamic Host Configuration Protocol
• DHCP Operation
• DHCP Message Format
• DHCP Message Type
• Advantages of DHCP
14. DHCP Operation
• A DHCP infrastructure consists of the
following elements,
– DHCP server
– DHCP client
– DHCP relay agents
19. Advantages of DHCP
• DHCP allows both manual and automatic
configurations.
• That is, the static addresses are created
manually and the dynamic addresses are
created automatically. Where as, BOOTP
allows only manual configuration
21. Internet Control Message Protocol
• Internet Control Message Protocol is an
integral part of an IP.
• It allows a router or destination host to
communicate with the source, typically to
report an error in IP datagram processing.
22. Internet Control Message Protocol
• Types of Messages
• ICMP Message Format
• Error Reporting
• ICMP Error Messages
• Debugging Tools
26. ICMP Error Messages
• Important points about ICMP error messages,
– No ICMP error message will be generated in response
to a datagram carrying an ICMP error message.
– No ICMP error message will be generated for a
fragmented datagram that is not the first fragment.
– No ICMP error message will be generated for a
datagram having a multicast address.
– No ICMP error message will be generated for a
datagram having a special address such as 127.0.0.0
or 0.0.0.0.
