DHCP服务器将IP地址提供给DHCP客户端时，会包含租约的有效期。除了租约期限外，还具有两个时间值T1和T2，其中T1定义为租约期限的一半，而T2定义为租约期限的的7/8。当到达T1定义的时间期限时，DHCP客户端会向提供租约的原始DHCP服务器发起DHCP REQUEST请求对租约进行更新，如果DHCP服务器接受此请求则回复DHCP ACK消息...
Renewal (T1) Time Value 4 RFC 2132 59 Rebinding (T2) Time Value 4 RFC 2132 60 Vendor class identifier n RFC 2132 61 Client-identifier n RFC 2132 62 NetWare/IP Domain N (1<=N<=255) RFC 2242 63 NetWare/IP Option N (1<=N<=255) ...
在DHCP客户端开始使用新地址之前,DHCP客户端必须计算与租用地址关联的时间参数,即租用时间(LT)、续订时间(T1)和重新绑定时间(T2)。 一般默认的 LT 是 72 个小时。如果需要,您也可以使用较短的租用时间,以便节约地址资源。 DHCPNAK 如果所选服务器无法满足DHCPREQUEST消息,则DHCP服务器会使用DHCPNAK消息进行响应。当...
(options) DHCP: DHCP Message Type = DHCP Offer DHCP: Subnet Mask = 255.255.240.0 DHCP: Renewal Time Value (T1) = 8 Days, 0:00:00 DHCP: Rebinding Time Value (T2) = 14 Days, 0:00:00 DHCP: IP Address Lease Time = 16 Days, 0:00:00 DHCP: Server Identifier = 157.54.48.151 DHCP...
DHCPACK消息包含新的租用和任何新的配置引數,以備在上一次租用期間對伺服器進行任何更改時使用。如果客戶端由於某種原因在保留租約時無法到達伺服器,則在原始DHCP伺服器在T2內未響應續訂請求後,它會嘗試從任何DHCP伺服器續訂地址。T2的預設值為(7/8 x LT)。 這意味著T1 < T2< LT。
elif t2 == 'never': return False else: return t1 >= t2 def timestamp_is_lt(t1, t2): if t1 == 'never': return False elif t2 == 'never': return t1 != 'never' else: return t1 < t2 def timestamp_is_between(t, tstart, tend): ...
(options) DHCP: DHCP Message Type = DHCP ACK DHCP: Renewal Time Value (T1) = 8 Days, 0:00:00 DHCP: Rebinding Time Value (T2) = 14 Days, 0:00:00 DHCP: IP Address Lease Time = 16 Days, 0:00:00 DHCP: Server Identifier = 157.54.48.151 DHCP: Subnet Mask = 255.255.240.0 DHCP:...
Lease time 58 Renewal (T1) time value 59 Rebinding (T2) time value 31 Perform router discovery 33 Static route 43 Vendor-specific information 249 Classless static routes DHCP option parameters DHCP servers can be configured to provide optional data that fully configures TCP/IP on a client. Some...
Allocated lease: 864000 seconds, T1: 331858 seconds, T2: 756000 seconds Lease from May 21 19:00:29 2012 to May 31 19:00:29 2012 DHCP server: 10.1.1.1 Transaction ID: 0xcde72232 Classless static routes: Destination: 20.1.1.0, Mask: 255.255.255.0, NextHop: 10.1.1.2 DNS servers: 20.1....
Lease time 58 Renewal (T1) time value 59 Rebinding (T2) time value 31 Perform router discovery 33 Static route 43 Vendor-specific information 249 Classless static routes DHCP Option Parameters DHCP servers can be configured to provide optional data that fully configures TCP/IP on a client. Some...