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Update documentation: options concatenation is now supported.

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This commit is contained in:
Nicholas J. Kain 2011-07-27 07:43:09 -04:00
parent 13f5ab56e2
commit 916ddf10e5
1 changed files with 7 additions and 12 deletions
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@ -31,14 +31,10 @@ the ability to service multiple client requests simultaneously; a single ifchd
is sufficient for multiple ndhc clients. Only exotic setups should require is sufficient for multiple ndhc clients. Only exotic setups should require
this functionality, but it does exist. this functionality, but it does exist.
Note that ndhc does not support the entire DHCP client protocol. Notably, DHCP ndhc fully implements RFC5227's address conflict detection and defense. Great
options concatenation and IPv4 Link Local Addressing as defined in RFC3927 are care is taken to ensure that address conflicts will be detected, and ndhc also
not and will not be supported. has extensive support for address defense. Care is taken to prevent
unintentional ARP flooding under any circumstance.
On the other hand, ndhc fully implements RFC5227's address conflict detection
and defense. Great care is taken to ensure that address conflicts will be
detected, and ndhc also has extensive support for address defense. Care is
taken to prevent unintentional ARP flooding under any circumstance.
ndhc also monitors hardware link status via netlink events and reacts ndhc also monitors hardware link status via netlink events and reacts
appropriately when interface carrier status changes or an interface is appropriately when interface carrier status changes or an interface is
@ -46,6 +42,9 @@ explicitly deconfigured. This functionality can be useful on wired networks
when transient carrier downtimes occur (or cables are changed), but it is when transient carrier downtimes occur (or cables are changed), but it is
particularly useful on wireless networks. particularly useful on wireless networks.
RFC3927's IPv4 Link Local Addressing is not supported. I have found v4 LLAs
to be more of an annoyance than a help. v6 LLAs work much better in practice.
FEATURES FEATURES
-------- --------
@ -308,10 +307,6 @@ Then in the file and sname fields:
'DHCP-OPTION-OVERLOAD:3' 'DHCP-OPTION-OVERLOAD:3'
I suspect some bad dhcp programs will hang given this input. I suspect some bad dhcp programs will hang given this input.
Options concatenation is a minefield of poor specification. There's a
follow-up RFC to make proper behavior somewhat more defined, but it's still
overly complex.
DHCP explicitly specifies that there is no minimum lease time and also DHCP explicitly specifies that there is no minimum lease time and also
specifies that the minimum default rebinding time is leasetime*0.875 and specifies that the minimum default rebinding time is leasetime*0.875 and
the minimum default renewing time is leasetime*0.500. All times are relative the minimum default renewing time is leasetime*0.500. All times are relative