为什么用nslookup查询成功，却ping不通,

[martin.yan]

有两台DC
DC1 192.168.1.253 DC1.test.local (主) windows 2003
DC2 192.168.1.254 DC1.test.local (辅) windows 2003

客户端:
ubuntu 8.04

现在从ubuntu主机:
ping 192.168.1.253 能通
ping DC1.TEST.local 不通
nslookup DC1.TEST.local 能查询

/etc/resolv.conf配置如下:
### BEGIN INFO
#
# Modified_by: NetworkManager
# Process: /usr/bin/NetworkManager
# Process_id: 4822
#
### END INFO

search TEST.LOCAL


nameserver 192.168.1.253


domain TEST.LOCAL

为什么会ping不能DC1.TEST.LOCAL ？