Preparing for network access.
ARP : address resolution protocol.
- Link level (local network).
- Converts an identified target's known IP to MAC@
- Or the MAC@ of Gateway router.
- ARP probes can be answered by an machine on local network, if it knows.
RARP : reverse address resolution protocol.
- Link level
Converts a MAC@ to an IP
- Usually, its own.
- Dedicated system on local sub-net set up to respond..
- Obsolete, replaced by BootP and DHCP
BOOTP : bootstrap protocol.
- Assigns an IP address to a network device.
- Dedicated system which does NOT have to reside on local sub-net.
- Request sent over port 67
- Response received on port 68
- Replaces RARP
- Superceeded by DHCP
DHCP : Dynamic Host Configuration Protocol.
- Provides both ARP and BootP(RARP) resolution.
- Dedicated system which does NOT have to reside on local sub-net.
- But often implemented on Gateway router.
- Or Gateway can recognize requests and forward to know DHcP server.
- Handles other service requuests.
- Lease time, how long can node use a given IP.
- IP of a local DNS server.
- Gateway IP of local sub-net.
- Determines/maintains dyanamic or static assignment of IPs.
Manual assignment :
- Information stored on node itself and read on boot up.
- Mostly useful on a small well controlled sub-net.