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authorLi RongQing <roy.qing.li@gmail.com>2015-10-15 08:54:36 (GMT)
committerDavid S. Miller <davem@davemloft.net>2015-10-19 02:23:52 (GMT)
commit26fb342c734061859fec1bd9e987bb6b78061ef0 (patch)
tree8e292c4de0611ef24b1e7ac70115c2e70cc5a1f7 /Documentation/filesystems
parent4be3158abe1e02d24f82b34101e41d662fae2185 (diff)
downloadlinux-26fb342c734061859fec1bd9e987bb6b78061ef0.tar.xz
ipconfig: send Client-identifier in DHCP requests
A dhcp server may provide parameters to a client from a pool of IP addresses and using a shared rootfs, or provide a specific set of parameters for a specific client, usually using the MAC address to identify each client individually. The dhcp protocol also specifies a client-id field which can be used to determine the correct parameters to supply when no MAC address is available. There is currently no way to tell the kernel to supply a specific client-id, only the userspace dhcp clients support this feature, but this can not be used when the network is needed before userspace is available such as when the root filesystem is on NFS. This patch is to be able to do something like "ip=dhcp,client_id_type, client_id_value", as a kernel parameter to enable the kernel to identify itself to the server. Signed-off-by: Li RongQing <roy.qing.li@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'Documentation/filesystems')
-rw-r--r--Documentation/filesystems/nfs/nfsroot.txt3
1 files changed, 3 insertions, 0 deletions
diff --git a/Documentation/filesystems/nfs/nfsroot.txt b/Documentation/filesystems/nfs/nfsroot.txt
index 2d66ed6..bb5ab6d 100644
--- a/Documentation/filesystems/nfs/nfsroot.txt
+++ b/Documentation/filesystems/nfs/nfsroot.txt
@@ -157,6 +157,9 @@ ip=<client-ip>:<server-ip>:<gw-ip>:<netmask>:<hostname>:<device>:<autoconf>:
both: use both BOOTP and RARP but not DHCP
(old option kept for backwards compatibility)
+ if dhcp is used, the client identifier can be used by following
+ format "ip=dhcp,client-id-type,client-id-value"
+
Default: any
<dns0-ip> IP address of first nameserver.