{"id":900,"date":"2008-10-07T22:03:00","date_gmt":"2008-10-07T14:03:00","guid":{"rendered":"http:\/\/note.systw.net\/note\/?p=900"},"modified":"2023-11-07T22:12:25","modified_gmt":"2023-11-07T14:12:25","slug":"cisco-dhcp","status":"publish","type":"post","link":"https:\/\/systw.net\/note\/archives\/900","title":{"rendered":"Cisco DHCP"},"content":{"rendered":"\n

\u555f\u52d5dhcp\u529f\u80fd
(config)#[no] server dhcp<\/strong>
\u9810\u8a2d\u662f\u555f\u52d5,\u53ef\u5728\u524d\u52a0no\u4f86\u95dc\u9589
ps:Cisco IOS\u4e2d\u7684Easy IP\u63d0\u4f9b\u4e00\u500b\u53ef\u9078\u64c7\u4e14\u5168\u529f\u80fd\u7684DHCP\u4f3a\u670d\u5668<\/p>\n\n\n\n

\u65b0\u589edhcp\u670d\u52d9\u540d\u7a31
(config)#ip dhcp pool < pooname>
<\/strong>\u5728\u5206\u914dip\u7d66client\u524d,\u6703\u5148\u9001ICMP\u6216ping\u5224\u65b7\u8a72\u5730\u5740\u662f\u5426\u88ab\u7528,\u9810\u8a2dping\u6b21\u6578\u662f\u5169\u6b21

\u8a2d\u5b9adhcp\u5206\u914d\u7684\u7d44\u614b
(config-dhcp)#[option]<\/strong>
option\u8aaa\u660e\u5982\u4e0b
network < ip> < mask> <\/strong>\u5b9a\u7fa9\u53ef\u4ee5\u5206\u914d\u7d66\u7684ip\u7bc4\u570d
dns-server < ip>\u3000\u8a2d\u5b9adns
default-router < ip> \u8a2d\u5b9adefault-gateway
domain-name < domain name>
netbios-name-server < ip> \u8a2d\u5b9awins<\/p>\n\n\n\n

ex:
(config)#ip dhcp pool dhcpzone
(config-dhcp)# network 10.1.20.0 255.255.255.0
(config-dhcp)# default-router 10.1.20.254
(config-dhcp)# dns-server 10.1.1.1 <\/p>\n\n\n\n

\u8a2d\u5b9adhcp\u79df\u671f
(config-dhcp)#lease < infinite | < days [hours [minutes]] >><\/strong>
\u5206\u914d\u7684ip\u9810\u8a2d24\u5c0f\u6642\u5c31\u6703\u88ab\u53d6\u56de  <\/p>\n\n\n\n

\u8a2d\u5b9adhcp\u4e0d\u8981\u5206\u914dip\u7684\u7bc4\u570d
(config)#ip dhcp excluded-address < ip range><\/strong>
ex:192.168.1.10-192.168.1.20\u7bc4\u570d\u7684ip\u4e0d\u767c
(config)#ip dhcp excluded-address 192.168.1.10 192.168.1.20<\/p>\n\n\n\n

\u8a2d\u5b9adhcp\u8cc7\u6599\u5eab
(config)#ip dhcp database < name><\/strong><\/p>\n\n\n\n

ps:
(config)#ip dhcp ?
pool\u3000 Configure DHCP address pools
excluded-address\u3000 Prevent DHCP from assigning certain addresses
relay\u3000 DHCP relay agent parameters<\/p>\n\n\n\n

……………………………<\/p>\n\n\n\n

\u91dd\u5c0dDHCP\u7684\u52d5\u4f5c\u9032\u884c\u932f\u8aa4\u6392\u9664<\/p>\n\n\n\n

#debug ip dhcp server events<\/strong>
\u6703\u986f\u793a\u4f3a\u670d\u9031\u671f\u6027\u5730\u6aa2\u8996\u662f\u5426\u79df\u7d04\u5230\u671f\u7684\u4e00\u4e9b\u8a0a\u606f,\u540c\u6642\u4e5f\u6703\u986f\u793a\u5730\u5740\u7684\u6b78\u9084\u548c\u5730\u5740\u7684\u5206\u914d\u7a0b\u5e8f
\u756b\u9762\u5927\u81f4\u5982\u4e0b
*Mar 2 00:16:37.427: DHCPD: Seeing if there is an internally specified pool class:
*Mar 2 00:16:37.431: DHCPD: htype 1 chaddr c001.0f1c.0000
*Mar 2 00:16:37.431: DHCPD: remote id 020a00000a01010101000000
*Mar 2 00:16:37.435: DHCPD: circuit id 00000000
*Mar 2 00:16:39.415: DHCPD: Seeing if there is an internally specified pool class:
*Mar 2 00:16:39.419: DHCPD: htype 1 chaddr c001.0f1c.0000
*Mar 2 00:16:39.419: DHCPD: remote id 020a00000a01010101000000
*Mar 2 00:16:39.423: DHCPD: circuit id 00000000
*Mar 2 00:16:42.603: DHCPD: no subnet configured for 192.168.1.2.<\/p>\n\n\n\n

#debug ip dhcp server packet<\/strong>
\u986f\u793adhcp packet\u7684\u89e3\u78bc 
\u756b\u9762\u5927\u81f4\u5982\u4e0b
*Mar 2 00:17:39.867: DHCPD: DHCPRELEASE message received from client
0063.6973.636f.2d63.3030.312e.3066.3163.2e30.3030.302d.4661.302f.30 (10.1.1.2).
*Mar 2 00:17:41.855: DHCPD: DHCPRELEASE message received from client
0063.6973.636f.2d63.3030.312e.3066.3163.2e30.3030.302d.4661.302f.30 (10.1.1.2).
*Mar 2 00:17:41.859: DHCPD: Finding a relay for client
0063.6973.636f.2d63.3030.312e.3066.3163.2e30.3030.302d.4661.302f.30 on interface
FastEthernet0\/1.
*Mar 2 00:17:54.775: DHCPD: DHCPDISCOVER received from client
0063.6973.636f.2d63.3030.312e.3066.3163.2e30.3030.302d.4661.302f.30 on interface
FastEthernet0\/1.
*Mar 2 00:17:54.779: DHCPD: Allocate an address without class information
(10.1.1.0)
*Mar 2 00:17:56.783: DHCPD: Sending DHCPOFFER to client
0063.6973.636f.2d63.3030.312e.3066.3163.2e30.3030.302d.4661.302f.30 (10.1.1.1).
*Mar 2 00:17:56.787: DHCPD: broadcasting BOOTREPLY to client c001.0f1c.0000.
*Mar 2 00:17:56.879: DHCPD: DHCPREQUEST received from client
0063.6973.636f.2d63.3030.312e.3066.3163.2e30.3030.302d.4661.302f.30.
*Mar 2 00:17:56.887: DHCPD: No default domain to append – abort update
*Mar 2 00:17:56.887: DHCPD: Sending DHCPACK to client
0063.6973.636f.2d63.3030.312e.3066.3163.2e30.3030.302d.4661.302f.30 (10.1.1.1).
*Mar 2 00:17:56.891: DHCPD: broadcasting BOOTREPLY to client c001.0f1c.0000.<\/p>\n\n\n\n

… <\/p>\n\n\n\n

#show ip dhcp binding<\/strong>
\u9a57\u8b49DHCP\u7684\u904b\u4f5c,\u6703\u986f\u793aDHCP\u670d\u52d9\u7684\u4e00\u7cfb\u5217\u7d44\u614b\u8a2d\u5b9a
\u756b\u9762\u5927\u81f4\u5982\u4e0b
IP address Hardware address Lease expiration Type
192.168.1.10 0100.16d3.234d.10 Mar 02 2008 01:15 AM Automatic
ps:
\u82e5\u8981\u91cb\u653e\u6240\u6709dhcp lease,\u53ef\u4f7f\u7528clear ip dhcp binding * <\/p>\n\n\n\n

#show ip dhcp conflict<\/strong>
\u7528\u4f86\u8a66\u5225\u662f\u5426\u6709ip\u885d\u7a81
\u756b\u9762\u5927\u81f4\u5982\u4e0b
IP address Detection method Detection time
172.16.1.5 Ping Aug 10 2013 8:56 PM
ps:
\u82e5\u8981\u6e05\u9664\u6240\u6709\u627e\u5230\u7684ip\u885d\u7a81,\u53ef\u4f7f\u7528clear ip dhcp conflict *<\/p>\n\n\n\n

#show ip dhcp server statistics<\/strong>
\u9a57\u8b49\u8def\u7531\u5668\u6240\u63a5\u6536\u548c\u9001\u51fa\u7684\u4e00\u4e9b\u8a0a\u606f\u6982\u6cc1,\u6703\u986f\u793a\u9001\u51fa\u548c\u63a5\u6536\u4e4bDHCP\u8a0a\u606f\u6578\u76ee\u7684\u4e00\u4e9b\u8cc7\u8a0a<\/p>\n\n\n\n

ps:
#show ip dhcp ?
database DHCP database agents
server Miscellaneous DHCP server information
conflict DHCP address conflicts
binding DHCP address bindings<\/p>\n\n\n\n

…<\/p>\n\n\n\n

dhcp relay\u7684\u529f\u80fd
ip helper-address
\u53ef\u5c07\u91cd\u8981\u7684UTP\u670d\u52d9\u7684\u5ee3\u64ad\u8981\u6c42\u5f9e\u8def\u7531\u5668\u8f49\u9001\u51fa\u53bb
\u5167\u5b9a\u4e0aip helper-address\u547d\u4ee4\u53ef\u4ee5\u8f49\u50b3\u4e0b\u5217\u516b\u7a2eUTP\u670d\u52d9:
Time
TACACS
DNS
BOOTP\/DHCP Server
BOOTP\/DHCP Client
TFTP
NetBIOS Name Service
NetBIOS datagram Service<\/p>\n\n\n\n

\u8a2d\u5b9adhcp relay\u4ee5\u4f7f\u7528\u5916\u90e8dhcp server 
(config-if)# ip helper-address < external dhcp ip><\/strong>
\u8a72\u4ecb\u9762\u9808\u8981\u6709\u8a2d\u5b9aip,\u7528\u4f86\u63a5\u6536\u5916\u90e8dhcp\u7684\u8a0a\u606f
ip helper-address\u53ef\u4ee5\u8a2d\u5b9a\u591a\u7d44
ex:
\u5728vlan5\u4f7f\u7528192.168.199.4\u7684\u5916\u90e8dhcp\u914dip 
(config)# interface vlan5
(config-if)# ip address 192.168.1.1 255.255.255.0
(config-if)# ip helper-address 192.168.199.4 <\/p>\n","protected":false},"excerpt":{"rendered":"

\u555f\u52d5dhcp\u529f\u80fd(config)#[no] server d …<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"fifu_image_url":"","fifu_image_alt":"","_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[32],"tags":[],"class_list":["post-900","post","type-post","status-publish","format-standard","hentry","category-cisco-network"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/posts\/900","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/comments?post=900"}],"version-history":[{"count":0,"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/posts\/900\/revisions"}],"wp:attachment":[{"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/media?parent=900"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/categories?post=900"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/tags?post=900"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}