由于某些原因， tftpboot不能在filename参数中使用冒号：
group { filename "node7:linux/pxelinux.0"; host machine_7a { hardware ethernet 02:01:02:02:01:11; fixed-address 192.168.10.8; } host machine_7b { hardware ethernet 02:01:02:02:01:12; fixed-address 192.168.10.9; } }
如果我把冒号改成短划线，远程机器可以正常工作。 你知道为什么filename参数中的冒号不起作用吗？
更新 ：
当我将filename设置为"node7-linux/pxelinux.0"时，从/var/log/message
Jan 22 22:52:48 linux-yp1y dhcpd: DHCPDISCOVER from 02:01:02:02:01:11 via br0 Jan 22 22:52:48 linux-yp1y dhcpd: DHCPOFFER on 192.168.10.7 to 02:01:02:02:01:11 via br0 Jan 22 22:52:49 linux-yp1y dhcpd: DHCPDISCOVER from 02:01:02:02:01:11 via br0 Jan 22 22:52:49 linux-yp1y dhcpd: DHCPOFFER on 192.168.10.7 to 02:01:02:02:01:11 via br0 Jan 22 22:52:51 linux-yp1y dhcpd: DHCPREQUEST for 192.168.10.7 (192.168.10.1) from 02:01:02:02:01:11 via br0 Jan 22 22:52:51 linux-yp1y dhcpd: DHCPACK on 192.168.10.7 to 02:01:02:02:01:11 via br0 Jan 22 22:52:51 linux-yp1y atftpd[12967]: Serving node7-linux/pxelinux.0 to 192.168.10.7:1024 Jan 22 22:52:51 linux-yp1y dhcpd: DHCPDISCOVER from 02:01:02:02:01:11 via br0 Jan 22 22:52:51 linux-yp1y dhcpd: DHCPOFFER on 192.168.10.7 to 02:01:02:02:01:11 via br0 Jan 22 22:52:52 linux-yp1y dhcpd: DHCPDISCOVER from 02:01:02:02:01:11 via br0 Jan 22 22:52:52 linux-yp1y dhcpd: DHCPOFFER on 192.168.10.7 to 02:01:02:02:01:11 via br0 Jan 22 22:52:54 linux-yp1y dhcpd: DHCPREQUEST for 192.168.10.7 (192.168.10.1) from 02:01:02:02:01:11 via br0 Jan 22 22:52:54 linux-yp1y dhcpd: DHCPACK on 192.168.10.7 to 02:01:02:02:01:11 via br0 Jan 22 22:52:54 linux-yp1y atftpd[12967]: Serving node7-linux/pxelinux.cfg/default to 192.168.10.7:1024 Jan 22 22:52:54 linux-yp1y atftpd[12967]: Serving node7-linux/vmlinuz to 192.168.10.7:1025 Jan 22 22:52:55 linux-yp1y atftpd[12967]: Serving node7-linux/initrd to 192.168.10.7:1026 Jan 22 22:53:14 linux-yp1y dhcpd: DHCPDISCOVER from 02:01:02:02:01:11 via br0 Jan 22 22:53:14 linux-yp1y dhcpd: DHCPOFFER on 192.168.10.7 to 02:01:02:02:01:11 via br0 Jan 22 22:53:14 linux-yp1y dhcpd: DHCPREQUEST for 192.168.10.7 (192.168.10.1) from 02:01:02:02:01:11 via br0 Jan 22 22:53:14 linux-yp1y dhcpd: DHCPACK on 192.168.10.7 to 02:01:02:02:01:11 via br0 Jan 22 22:53:15 linux-yp1y dhcpd: DHCPDISCOVER from 02:01:02:02:01:12 via br0 Jan 22 22:53:15 linux-yp1y dhcpd: DHCPOFFER on 192.168.10.8 to 02:01:02:02:01:12 via br0 Jan 22 22:53:15 linux-yp1y dhcpd: DHCPREQUEST for 192.168.10.8 (192.168.10.1) from 02:01:02:02:01:12 via br0 Jan 22 22:53:15 linux-yp1y dhcpd: DHCPACK on 192.168.10.8 to 02:01:02:02:01:12 via br0
当我将filename设置为"node7:linux/pxelinux.0"时，从/var/log/message输出：
Jan 22 23:16:57 linux-yp1y kernel: [343021.700191] br0: port 6(vnet6) entering forwarding state Jan 22 23:16:57 linux-yp1y kernel: [343021.700296] device vnet6 left promiscuous mode Jan 22 23:16:57 linux-yp1y kernel: [343021.700302] br0: port 6(vnet6) entering disabled state Jan 22 23:16:57 linux-yp1y kernel: [343021.721423] br0: port 7(vnet7) entering forwarding state Jan 22 23:16:57 linux-yp1y kernel: [343021.721467] device vnet7 left promiscuous mode Jan 22 23:16:57 linux-yp1y kernel: [343021.721470] br0: port 7(vnet7) entering disabled state Jan 22 23:16:58 linux-yp1y kernel: [343021.742969] br2: port 4(vnet8) entering forwarding state Jan 22 23:16:58 linux-yp1y kernel: [343021.743040] device vnet8 left promiscuous mode Jan 22 23:16:58 linux-yp1y kernel: [343021.743042] br2: port 4(vnet8) entering disabled state Jan 22 23:16:58 linux-yp1y ifdown: vnet6 Jan 22 23:16:58 linux-yp1y ifdown: Interface not available and no configuration found. Jan 22 23:16:58 linux-yp1y ifdown: vnet7 Jan 22 23:16:58 linux-yp1y ifdown: Interface not available and no configuration found. Jan 22 23:16:58 linux-yp1y ifdown: vnet8 Jan 22 23:16:58 linux-yp1y ifdown: Interface not available and no configuration found. Jan 22 23:17:01 linux-yp1y kernel: [343025.377050] device vnet6 entered promiscuous mode Jan 22 23:17:01 linux-yp1y kernel: [343025.393810] br0: port 6(vnet6) entering forwarding state Jan 22 23:17:01 linux-yp1y kernel: [343025.393814] br0: port 6(vnet6) entering forwarding state Jan 22 23:17:01 linux-yp1y kernel: [343025.449562] device vnet7 entered promiscuous mode Jan 22 23:17:01 linux-yp1y kernel: [343025.466276] br0: port 7(vnet7) entering forwarding state Jan 22 23:17:01 linux-yp1y kernel: [343025.466280] br0: port 7(vnet7) entering forwarding state Jan 22 23:17:01 linux-yp1y kernel: [343025.557549] device vnet8 entered promiscuous mode Jan 22 23:17:01 linux-yp1y kernel: [343025.574265] br2: port 4(vnet8) entering forwarding state Jan 22 23:17:01 linux-yp1y kernel: [343025.574270] br2: port 4(vnet8) entering forwarding state Jan 22 23:17:03 linux-yp1y dhcpd: DHCPDISCOVER from 02:01:02:02:01:11 via br0 Jan 22 23:17:03 linux-yp1y dhcpd: DHCPOFFER on 192.168.10.7 to 02:01:02:02:01:11 via br0 Jan 22 23:17:04 linux-yp1y dhcpd: DHCPDISCOVER from 02:01:02:02:01:11 via br0 Jan 22 23:17:04 linux-yp1y dhcpd: DHCPOFFER on 192.168.10.7 to 02:01:02:02:01:11 via br0 Jan 22 23:17:05 linux-yp1y kernel: [343029.580829] br2: port 4(vnet8) entering forwarding state Jan 22 23:17:06 linux-yp1y dhcpd: DHCPREQUEST for 192.168.10.7 (192.168.10.1) from 02:01:02:02:01:11 via br0 Jan 22 23:17:06 linux-yp1y dhcpd: DHCPACK on 192.168.10.7 to 02:01:02:02:01:11 via br0 Jan 22 23:17:06 linux-yp1y dhcpd: DHCPDISCOVER from 02:01:02:02:01:12 via br0 Jan 22 23:17:06 linux-yp1y dhcpd: DHCPOFFER on 192.168.10.8 to 02:01:02:02:01:12 via br0 Jan 22 23:17:07 linux-yp1y dhcpd: DHCPDISCOVER from 02:01:02:02:01:12 via br0 Jan 22 23:17:07 linux-yp1y dhcpd: DHCPOFFER on 192.168.10.8 to 02:01:02:02:01:12 via br0 Jan 22 23:17:09 linux-yp1y dhcpd: DHCPREQUEST for 192.168.10.8 (192.168.10.1) from 02:01:02:02:01:12 via br0 Jan 22 23:17:09 linux-yp1y dhcpd: DHCPACK on 192.168.10.8 to 02:01:02:02:01:12 via br0 Jan 22 23:17:12 linux-yp1y kernel: [343035.804008] vnet8: no IPv6 routers present Jan 22 23:17:12 linux-yp1y kernel: [343036.148005] vnet7: no IPv6 routers present Jan 22 23:17:12 linux-yp1y kernel: [343036.397004] vnet6: no IPv6 routers present Jan 22 23:17:24 linux-yp1y dhcpd: DHCPDISCOVER from 02:01:02:02:01:11 via br0 Jan 22 23:17:24 linux-yp1y dhcpd: DHCPOFFER on 192.168.10.7 to 02:01:02:02:01:11 via br0 Jan 22 23:17:25 linux-yp1y dhcpd: DHCPDISCOVER from 02:01:02:02:01:11 via br0 Jan 22 23:17:25 linux-yp1y dhcpd: DHCPOFFER on 192.168.10.7 to 02:01:02:02:01:11 via br0 Jan 22 23:17:27 linux-yp1y dhcpd: DHCPREQUEST for 192.168.10.7 (192.168.10.1) from 02:01:02:02:01:11 via br0 Jan 22 23:17:27 linux-yp1y dhcpd: DHCPACK on 192.168.10.7 to 02:01:02:02:01:11 via br0 Jan 22 23:17:27 linux-yp1y dhcpd: DHCPDISCOVER from 02:01:02:02:01:12 via br0 Jan 22 23:17:27 linux-yp1y dhcpd: DHCPOFFER on 192.168.10.8 to 02:01:02:02:01:12 via br0 Jan 22 23:17:28 linux-yp1y dhcpd: DHCPDISCOVER from 02:01:02:02:01:12 via br0 Jan 22 23:17:28 linux-yp1y dhcpd: DHCPOFFER on 192.168.10.8 to 02:01:02:02:01:12 via br0 Jan 22 23:17:30 linux-yp1y dhcpd: DHCPREQUEST for 192.168.10.8 (192.168.10.1) from 02:01:02:02:01:12 via br0 Jan 22 23:17:30 linux-yp1y dhcpd: DHCPACK on 192.168.10.8 to 02:01:02:02:01:12 via br0