pxe-e32: tftp open timeout

pxe server is rhel
which dhcp and tftp services are turned on, disable set to no, the firewall is also turned off
why the client get the ip newspaper, reported this wrong?

[root @ localhost ~] # cd / tftpboot
[root @ localhost tftpboot] # tree
.
| - boot.msg
| - filesystem.squashfs
| - home
| `- partimag
| - initrd.img
| - pxelinux.0
| - pxelinux.cfg
| `- default
`- vmlinuz

3 directories, 6 files
[root @ localhost tftpboot] #
------ Solution ---------------------------- ----------------
http://hi.baidu.com/% B3% E5% BD% F8% BB% A5% C1% AA% CD% F8 / blog/item/27b799de71457550cdbf1aeb.html
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I have read this post, not a cable problem, where the estimate is not configured
because the other machine, and I set up a network boot, but also in post-card to get ip tftp here. . .
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It has a rhel related configuration examples, see the steps where you need to check is not consistent
http://sina.fqdaili.com/baidu.com.php ? u = d9e30512054e90a0aaOi8vcGJyYXVuLm5ldGhlbmNlLmNvbS9kb2MvbmV0L3B4ZS5odG1s & b = 15
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3 floor, I am here to open the link. . .

pxe-e32: tftp open timeout
someone else has solved this problem, Results posted!
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landlord really, resolved to share, a statement posted on the bin
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http://bbs.chinaunix.net/thread-3620659-1-1.html

landlord to resolve the post here, but I have not solved.