關(guān)于DHCP的幾個(gè)不是問(wèn)題的問(wèn)題

dylibin

1、tail -f /var/log/messages

May 12 11:12:41 fsd dhcpd: if Myser.xxx.com IN A rrset doesn't exist add my.xxx.com 300 IN A 192.168.0.217: timed out.
不知道以上信息什么意思？

2、tail -f /var/db/dhcpd/dhcpd.leases

lease 192.168.0.235 {
  starts 2 2009/05/12 11:39:06;
  ends 2 2009/05/12 11:49:06;
  binding state active;
  next binding state free;
  hardware ethernet 00:02:55:d6:ba:6d;
  uid "\001RAS \000\002U\326\272\215\000\000\007\000\000\000";
  client-hostname "Myser";
}
lease 192.168.0.240 {
  starts 2 2009/05/12 11:39:34;
  ends 2 2009/05/12 11:49:34;
  binding state active;
  next binding state free;
  hardware ethernet 00:02:55:d6:ba:6d;
  uid "\001RAS \000\002U\326\272\215\000\000\000\000\000\000";
  client-hostname "Myser";
}
lease 192.168.0.220 {
  starts 2 2009/05/12 11:39:34;
  ends 2 2009/05/12 11:49:34;
  binding state active;
  next binding state free;
  hardware ethernet 00:02:55:d6:ba:6d;
  uid "\001RAS \000\002U\326\272\215\000\000\011\000\000\000";
  client-hostname "Myser";

以上 client-hostname "Myser" 對(duì)應(yīng)的主機(jī)是設(shè)置了固定IP的機(jī)器。難道DHCP也要給固定IP機(jī)器預(yù)留一個(gè)動(dòng)態(tài)IP？為什么還會(huì)不斷的變化IP？

3、今天修改了dhcpd.conf的以下兩個(gè)租期參數(shù)，重啟dhcpd后不斷有同事打電話說(shuō)分不到IP地址，怎么會(huì)呢？
default-lease-time 10800; （3小時(shí)）  
max-lease-time 28800;（8小時(shí)）

[ 本帖最后由 dylibin 于 2009-5-13 10:33 編輯 ]

ssffzz1

第一個(gè)是DDNS的，可以忽略他。
第二個(gè)問(wèn)題，你帖配置吧。
第三個(gè)你明天再觀察一下
先逐個(gè)解決。

dylibin

這么說(shuō)第二個(gè)問(wèn)題的確是個(gè)問(wèn)題。配置怎么可能會(huì)有問(wèn)題？我是利用一臺(tái)dhcpServer通過(guò)dhcp中繼為多Vlan提供IP的，其中192.168.0.0段的配置如下。Myser本機(jī)設(shè)置為固定IP192.168.0.5。

shared-network Vlan-0 {
  subnet 192.168.0.0 netmask 255.255.255.0 {
    option routers 192.168.0.254;
    range 192.168.0.200 192.168.0.249;
  }
}

ssffzz1

1、你清除那個(gè)DHCP租約再重新統(tǒng)計(jì)一次，結(jié)果貼上來(lái)。
2、DHCPD的配置貼上來(lái)。

dylibin

# dhcpd.conf
#
# Sample configuration file for ISC dhcpd
#

# option definitions common to all supported networks...
option domain-name "domain.com";
option domain-name-servers 192.168.0.1;

default-lease-time 3600;
max-lease-time 10800;

# If this DHCP server is the official DHCP server for the local
# network, the authoritative directive should be uncommented.
#authoritative;

# ad-hoc DNS update scheme - set to "none" to disable dynamic DNS updates.
ddns-update-style ad-hoc;

# Use this to send dhcp log messages to a different log file (you also
# have to hack syslog.conf to complete the redirection).
log-facility local7;

# No service will be given on this subnet, but declaring it helps the
# DHCP server to understand the network topology.

shared-network Vlan-0 {
  subnet 192.168.0.0 netmask 255.255.255.0 {
    option routers 192.168.0.1;
    range 192.168.0.200 192.168.0.249;
  }
}
shared-network Vlan-1 {
  subnet 192.168.1.0 netmask 255.255.255.0 {
    option routers 192.168.1.1;
    range 192.168.1.101 192.168.1.249;
  }
}
shared-network Vlan-2 {
  subnet 192.168.2.0 netmask 255.255.255.0 {
    option routers 192.168.2.1;
    range 192.168.2.101 192.168.2.249;
  }
}
shared-network Vlan-3 {
  subnet 192.168.3.0 netmask 255.255.255.0 {
    option routers 192.168.3.1;
    range 192.168.3.101 192.168.3.249;
  }
}


echo "">/var/db/dhcpd/dhcpd.leases


tail -f /var/db/dhcpd/dhcpd.leases

lease 192.168.0.240 {
  starts 3 2009/05/13 02:13:03;
  ends 3 2009/05/13 03:13:03;
  binding state active;
  next binding state free;
  hardware ethernet 00:e0:4c:39:02:db;
  uid "\001RAS \000\340L9\002\333\000\000\007\000\000\000";
  client-hostname "s-k12";
}
lease 192.168.0.239 {
  starts 3 2009/05/13 02:13:03;
  ends 3 2009/05/13 03:13:03;
  binding state active;
  next binding state free;
  hardware ethernet 00:02:55:d6:ba:6d;
  uid "\001RAS \000\002U\326\272\215\000\000\000\000\000\000";
  client-hostname "Myser";
}
lease 192.168.1.249 {
  starts 3 2009/05/13 02:13:06;
  ends 3 2009/05/13 03:13:06;
  binding state active;
  next binding state free;
  hardware ethernet 00:23:4e:db:a6:8b;
  uid "\001\000#N\333\246\213";
  client-hostname "Lenovo-PC";
}
lease 192.168.0.238 {
  starts 3 2009/05/13 02:13:07;
  ends 3 2009/05/13 03:13:07;
  binding state active;
  next binding state free;
  hardware ethernet 00:e0:4c:39:02:db;
  uid "\001RAS \000\340L9\002\333\000\000\006\000\000\000";
  client-hostname "s-k12";
}
lease 192.168.2.243 {
  starts 3 2009/05/13 02:13:09;
  ends 3 2009/05/13 03:13:09;
  binding state active;
  next binding state free;
  hardware ethernet 00:21:00:b9:db:87;
  uid "\001\000!\000\271\333\207";
  client-hostname "cic";
}
lease 192.168.0.237 {
  starts 3 2009/05/13 02:13:12;
  ends 3 2009/05/13 03:13:12;
  binding state active;
  next binding state free;
  hardware ethernet 00:02:55:d6:ba:6d;
  uid "\001RAS \000\002U\326\272\215\000\000\006\000\000\000";
  client-hostname "Myser";
}
lease 192.168.2.109 {
  starts 3 2009/05/13 02:13:12;
  ends 3 2009/05/13 03:13:12;
  binding state active;
  next binding state free;
  hardware ethernet 00:11:5b:53:5c:fa;
  uid "\001\000\021[S\\\372";
  client-hostname "PC-20090108FWCW";
}
lease 192.168.2.142 {
  starts 3 2009/05/13 02:13:12;
  ends 3 2009/05/13 03:13:12;
  binding state active;
  next binding state free;
  hardware ethernet 00:11:5b:d7:5e:97;
  uid "\001\000\021[\327^\227";
  client-hostname "WWW-CF8FB9A3E5E";
}
lease 192.168.0.236 {
  starts 3 2009/05/13 02:13:15;
  ends 3 2009/05/13 03:13:15;
  binding state active;
  next binding state free;
  hardware ethernet 00:e0:4c:39:02:db;
  uid "\001RAS \000\340L9\002\333\000\000\001\000\000\000";
  client-hostname "s-k12";
}
lease 192.168.0.235 {
  starts 3 2009/05/13 02:13:17;
  ends 3 2009/05/13 03:13:17;
  binding state active;
  next binding state free;
  hardware ethernet 00:e0:4c:39:02:db;
  uid "\001RAS \000\340L9\002\333\000\000\002\000\000\000";
  client-hostname "s-k12";
}
lease 192.168.2.115 {
  starts 3 2009/05/13 02:13:19;
  ends 3 2009/05/13 03:13:19;
  binding state active;
  next binding state free;
  hardware ethernet 00:21:00:c3:a1:9f;
  uid "\001\000!\000\303\241\237";
  client-hostname "Lenovo-PC";
}
lease 192.168.0.234 {
  starts 3 2009/05/13 02:13:21;
  ends 3 2009/05/13 03:13:21;
  binding state active;
  next binding state free;
  hardware ethernet 00:e0:4c:39:02:db;
  uid "\001RAS \000\340L9\002\333\000\000\010\000\000\000";
  client-hostname "s-k12";
}

注：主機(jī)s-k12和Myser都是網(wǎng)內(nèi)固定IP的機(jī)器。

[ 本帖最后由 dylibin 于 2009-5-13 10:34 編輯 ]

helon

是這樣的：
1、沒(méi)看到配置中有保留IP配置項(xiàng)
2、試一下在每個(gè)shared-network中加入192.168.0.x網(wǎng)段，但地址范圍不要沖突。因?yàn)槟愕姆��?wù)器的地址時(shí)192.168.0.1的。

dylibin

原帖由 helon 于 2009-5-13 10:48 發(fā)表
是這樣的：
1、沒(méi)看到配置中有保留IP配置項(xiàng)
2、試一下在每個(gè)shared-network中加入192.168.0.x網(wǎng)段，但地址范圍不要沖突。因?yàn)槟愕姆��?wù)器的地址時(shí)192.168.0.1的。

配置中是沒(méi)有保留項(xiàng)，因?yàn)槊總�(gè)網(wǎng)段分配的地址范圍都有保留，固定IP的機(jī)器不可能與動(dòng)態(tài)IP有沖突。
不明白“在每個(gè)shared-network中加入192.168.0.x網(wǎng)段”是什么意思。

dylibin

starts 3 2009/05/13 02:13:03;
ends 3 2009/05/13 03:13:03;
02:13:03是2點(diǎn)13分03秒嗎？為什么不是分配地址的時(shí)間，現(xiàn)在明明是上午，我的機(jī)器的系統(tǒng)時(shí)間沒(méi)有問(wèn)題呀。這個(gè)2點(diǎn)是凌晨2點(diǎn)嗎？一直都沒(méi)仔細(xì)觀察過(guò)，原來(lái)不明白的地方還蠻多。

[ 本帖最后由 dylibin 于 2009-5-13 11:37 編輯 ]

ssffzz1

lease 192.168.0.240 {
  starts 3 2009/05/13 02:13:03;
  ends 3 2009/05/13 03:13:03;
  binding state active;
  next binding state free;
  hardware ethernet 00:e0:4c:39:02:db;
  uid "\001RAS \000\340L9\002\333\000\000\007\000\000\000";
  client-hostname "s-k12";
}
lease 192.168.0.239 {
  starts 3 2009/05/13 02:13:03;
  ends 3 2009/05/13 03:13:03;
  binding state active;
  next binding state free;
  hardware ethernet 00:02:55:d6:ba:6d;
  uid "\001RAS \000\002U\326\272\215\000\000\000\000\000\000";
  client-hostname "Myser";
}


你核對(duì)一下機(jī)器的MAC地址是不是和真是的機(jī)器是一致的，我咋懷疑有重名的機(jī)器呢。
另外機(jī)器時(shí)間最好調(diào)正確，不過(guò)這個(gè)和DHCP沒(méi)關(guān)系的，僅影響到日志。

dylibin

你核對(duì)一下機(jī)器的MAC地址是不是和真是的機(jī)器是一致的，我咋懷疑有重名的機(jī)器呢。
另外機(jī)器時(shí)間最好調(diào)正確，不過(guò)這個(gè)和DHCP沒(méi)關(guān)系的，僅影響到日志。

s-k12和Myser兩臺(tái)機(jī)器的MAC和對(duì)應(yīng)的機(jī)器是一致的.我注意到lenovo-pc是有重名的現(xiàn)象，那是因?yàn)橛幸慌�電腦是經(jīng)銷商安裝的系統(tǒng)。我搞不清楚的就是，為什么指定IP的機(jī)器，DHCP也要分配租期，而且好像是這個(gè)IP還不斷的變化。
另外機(jī)器的時(shí)間是正常的，都定期ntpdate，不存在不正確的問(wèn)題。
Web# date
Wed May 13 15:08:37 CST 2009

[ 本帖最后由 dylibin 于 2009-5-13 15:08 編輯 ]