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Centos PXE - PXE-E32: TFTP open timeout

Posted on 2010-09-07
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Last Modified: 2013-12-15
Hello, I am setting up a PXE Centos network installation server according to the instructions at http://www.centos.org/docs/5/html/Installation_Guide-en-US/ch-pxe.html

I have successfully been able to activate DHCP, NFS and TFTP but when booting from the network I get the following error:

Client IP: <valid IP) etc
GATEWAY IP :<correct ip>
PXE-E32: TFTP open timeout

I have attached the /etc/dhcpd.conf file and  also /etc/xinetd.d/tftp ,the /tftpboot folder was created using the PXEOS command yielding an existing path to "/tftpboot/linux-install/pxelinux.0" so any tips are appreciated!


ddns-update-style interim;
subnet 10.200.0.0  netmask 255.255.255.0 {
        option routers                  10.200.0.250;
        option subnet-mask              255.255.255.0;
        option domain-name              "ascade.se";
        option domain-name-servers      10.200.0.11;

        range 10.200.0.223 10.200.0.229;

    allow booting; allow bootp; class "pxeclients" { match if substring(option vendor-class-identifier, 0, 9) = "PXEClient"; next-server 10.200.0.108; filename "linux-install/pxelinux.0"; }

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service tftp
{
        disable = no
        socket_type             = dgram
        protocol                = udp
        wait                    = yes
        user                    = root
        server                  = /usr/sbin/in.tftpd
        server_args             = -s /tftpboot
        per_source              = 11
        cps                     = 100 2
        flags                   = IPv4
}

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Question by:AndersBiro
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by:AndersBiro
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As an update I can mention that there might be something wrong with the TFTP server, I am able to login and connect using the tftp client but whenever I use the "get" command to transfer a file it says "Transfer timed out" so I would start troubleshooting here albeit i have very little knowledge of TFTP.
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by:AndersBiro
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Embarassingly enough it seems like I used the wrong folder using get so TFTP using the TFTP client works fine now.
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AndersBiro earned 0 total points
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Next update is that I know found out that the PXE parameters as mentionend in the Centos manual was the cause of the problem and PXE booting now works fine once I replaced the parameters with:

        next-server 10.200.0.108      
        filename "linux-install/pxelinux.0";      

I am not done yet though as the installation program now freezes at the blue "Welcome to Centos"-screen but does not proceed after that point so is there some transition that I should be aware of?
(Perhaps from PXE boot program to the Centos ISO-files?)
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by:AndersBiro
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I suppose this can be closed since the original problem has been resolved and I will create another question for the new one.
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by:TobiasHolm
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You can select your own answer as the correct one! ;)
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