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ipconfig: send host-name in DHCP requests

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Normally dhclient can be configured to send the "host-name" option
in DHCP requests to update the client's DNS record. However for an
NFSROOT system, dhclient shall never be called (which may change the
IP addr and therefore lose your root NFS mount connection).

So enable updating the DNS record with kernel parameter

	ip=::::$HOST_NAME::dhcp

Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Wu Fengguang 2010-05-30 17:19:53 +00:00 committed by David S. Miller
parent 614f60fa9d
commit 130c0f47fd
1 changed files with 7 additions and 0 deletions
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7
net/ipv4/ipconfig.c
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@ -665,6 +665,13 @@ ic_dhcp_init_options(u8 *options)
memcpy(e, ic_req_params, sizeof(ic_req_params)); memcpy(e, ic_req_params, sizeof(ic_req_params));
e += sizeof(ic_req_params); e += sizeof(ic_req_params);
if (ic_host_name_set) {
*e++ = 12; /* host-name */
len = strlen(utsname()->nodename);
*e++ = len;
memcpy(e, utsname()->nodename, len);
e += len;
}
if (*vendor_class_identifier) { if (*vendor_class_identifier) {
printk(KERN_INFO "DHCP: sending class identifier \"%s\"\n", printk(KERN_INFO "DHCP: sending class identifier \"%s\"\n",
vendor_class_identifier); vendor_class_identifier);