How to configure DHCP Proxy?
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First, thanks a lot for your answers guys.
Second, Jaymes Driver, this is exactly what I was looking for.
I don’t mean that i was looking for specific answer, but you answered all my questions. and don’t worry… i learned a lot!Now my problem is when I’m restarting the dnsmasq service, I didn’t get this error: “dnsmasq: failed to create listening socket for port 53: Address already in use failed!”. instead I’m getting " Restarting DNS forwarder and DHCP server configuration syntax check"
again, thanks for everyone!
updae 1:
so I ran " dnsmasq -d", getting “dnsmasq: failed to create listening socket for port 53: Permission denied”
next - with sudo, getting:
[CODE]dnsmasq: started, version 2.68 cachesize 150
dnsmasq: compile time options: IPv6 GNU-getopt DBus i18n IDN DHCP DHCPv6 no-Lua TFTP conntrack ipset auth
dnsmasq: reading /etc/resolv.conf
dnsmasq: using nameserver 209.222.18.218#53
dnsmasq: using nameserver 209.222.18.222#53
dnsmasq: using nameserver 10.0.0.1#53
dnsmasq: read /etc/hosts - 5 addresses[/CODE]10.0.0.1 is my router-dhcp-dns
my real FOG real ip is 10.0.0.210updae 2:
I’m trying to start dnsmasq service:
[CODE] * Starting DNS forwarder and DHCP server dnsmasq
dnsmasq: illegal repeated keyword at line 1 of /etc/dnsmasq.d/ltsp.conf
[fail]
[/CODE]/etc/dnsmasq.d/ltsp.conf:
[CODE]port=0
log-dhcp
tftp-root=/tftpboot
dhcp-boot=undionly.kpxe,10.0.0.210
dhcp-option=17,/images
dhcp-option=vendor:PXEClient,6,2b
dhcp-no-override
pxe-prompt=“Press F8 for boot menu”, 0
pxe-service=X86PC, “Boot from network”, pxelinux
pxe-service=X86PC, “Boot from local hard disk”, 0
dhcp-range=10.0.0.210,proxy
[/CODE]update 3:
I figured it out.
There was a backup files in that directory. deleting them solved the problem. -
so I have another problem:
(Attached pic)[url=“/_imported_xf_attachments/1/1872_boot error.PNG?:”]boot error.PNG[/url]
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[quote=“Amit Madmoni, post: 45522, member: 29386”]so I have another problem:
(Attached pic)[/quote]Have a look through here, pay attention to the permissions section: [url]http://fogproject.org/wiki/index.php/Troubleshoot_TFTP[/url]
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Oh and also,
You need to make a copy (or symbolic link) of undionly.kpxe as undionly.0
This is a known issue with dnsmasq.
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failed at first stage.
I tried to telnet to port 69 on the server, but the port is closed.
In the server I checked that the tftpd-hpa service is running. -
Try restarting the service,
and check your firewall.
[CODE]sudo iptables -L[/CODE] -
everything is good according to the “Troubleshoot TFTP” guide.
I also changed permissions.
yet, can’t boot from ws.
what should I do next? -
What’s the output of this:
[CODE]ls -a /tftpboot[/CODE]
and, try changing /etc/dnsmasq.d/ltsp.conf:
this line:
[FONT=Consolas]dhcp-boot=undionly.kpxe,10.0.0.210 [/FONT]
[FONT=Consolas]to:[/FONT]
[FONT=Consolas]dhcp-boot=undionly.kpxe,[/FONT][FONT=Consolas]10.0.0.210[/FONT][FONT=Consolas],10.0.0.210[/FONT] -
output is attached.
I edited the /etc/dnsmasq.d/ltsp.conf file. same error.
[url=“/_imported_xf_attachments/1/1875_ls -a output.PNG?:”]ls -a output.PNG[/url]
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What happens when you try to get undionly.kpxe through command line?
You can use Windows, or a Linux live disk for this. There are examples for testing in the “Troubleshoot TFTP” page.
Please post the output of it.If you are successful, please do a TCP dump next, and post the resulting file. Here are some general instructions:
[CODE]sudo tcpdump -w issue.pcap -i eth0[/CODE]
You might need to change the interface name in the above command, seems like I have never had an interface named eth0 in Linux… This command will list all available interfaces. Pick the right one.
[CODE]ip link show[/CODE]Run the above capture command on the FOG machine, then start the remote target host. Wait till it fails, then stop tcpdump (ctrl+c), transfer the PCAP file to your PC and examine it using wireshark. After the capture is completed, please use the MAC address of the target host as the filter for sender & receiver. This address will filter out ALL traffic that isn’t coming from or going to the target client.
Example Filter (change the MAC addresses):
[CODE]eth.dst == 00:0C:CC:76:4E:07 || eth.src==00:0C:CC:76:4E:07[/CODE]Please also post this PCAP file so we can look at it and see what’s going on. And if you don’t filter the file for us, we will need the target host’s MAC as well so we can filter it.
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here is the pcap file:
[url]https://copy.com/iH3hRuI7Xcb6dfnY[/url]I forgot to mention that the remote host is a vm, and the network interface configured as a bridge
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The problem is that the client is asking for the wrong file.
It’s asking for pxelinux.0 which is not only wrong, but according to your screenshot that file does not exist - for real.
Re-examine ltsp.conf, make sure it’s giving either undionly.kpxe or undionly.0 and also restart the dnsmasq service and try again.
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Also,
I’m not seeing a packet sent from 10.0.0.210 telling the client to use undionly.0, or 10.0.0.210 as the next-server…
If you look at the capture you posted, there are a total of TWO packets sent from the FOG server to the client.
This might mean that the DHCP server is already handing out the boot-server and file name, options 066 and 067.
Do you have a network hub? (not a switch)
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here is my ltsp.conf file:
[CODE]port=0
log-dhcp
tftp-root=/tftpboot
dhcp-boot=undionly.kpxe,10.0.0.210,10.0.0.210
dhcp-option=17,/images
dhcp-option=vendor:PXEClient,6,2b
dhcp-no-override
pxe-prompt=“Press F8 for boot menu”, 0
pxe-service=X86PC, “Boot from network”, pxelinux
pxe-service=X86PC, “Boot from local hard disk”, 0
dhcp-range=10.0.0.210,proxy
[/CODE]I dont have a network hub.
again, I’m running the client under virtual box. does it matter? -
Change
[code]port=0
log-dhcp
tftp-root=/tftpboot
dhcp-boot=undionly.kpxe,10.0.0.210,10.0.0.210
dhcp-option=17,/images
dhcp-option=vendor:PXEClient,6,2b
dhcp-no-override
pxe-prompt=“Press F8 for boot menu”, 0
pxe-service=X86PC, “Boot from network”, pxelinux
pxe-service=X86PC, “Boot from local hard disk”, 0
dhcp-range=10.0.0.210,proxy[/code]To:
[code]port=0
log-dhcp
tftp-root=/tftpboot
dhcp-boot=undionly.kpxe,10.0.0.210,10.0.0.210
dhcp-option=17,/images
dhcp-option=vendor:PXEClient,6,2b
dhcp-no-override
pxe-prompt=“Press F8 for boot menu”, 0
pxe-service=X86PC, “Boot from network”, undionly.kpxe
pxe-service=X86PC, “Boot from local hard disk”, 0
dhcp-range=10.0.0.210,proxy[/code]Then make a copy of the undionly.kpxe to undionly.kpxe.0
[code]sudo cp /tftpboot/undionly.kpxe /tftpboot/undionly.kpxe.0[/code]
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[quote=“Amit Madmoni, post: 45626, member: 29386”]here is my ltsp.conf file:
[CODE]port=0
log-dhcp
tftp-root=/tftpboot
dhcp-boot=undionly.kpxe,10.0.0.210,10.0.0.210
dhcp-option=17,/images
dhcp-option=vendor:PXEClient,6,2b
dhcp-no-override
pxe-prompt=“Press F8 for boot menu”, 0
pxe-service=X86PC, “Boot from network”, pxelinux
pxe-service=X86PC, “Boot from local hard disk”, 0
dhcp-range=10.0.0.210,proxy
[/CODE]I dont have a network hub.
again, I’m running the client under virtual box. does it matter?[/quote]Did you restart the service after inserting the LTSP.conf file?
you need to successfully restart the service for your updated LTSP.conf file to be of any use to dnsmasq.
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This post is deleted! -
[quote=“Tom Elliott, post: 45628, member: 7271”]Change
[code]port=0
log-dhcp
tftp-root=/tftpboot
dhcp-boot=undionly.kpxe,10.0.0.210,10.0.0.210
dhcp-option=17,/images
dhcp-option=vendor:PXEClient,6,2b
dhcp-no-override
pxe-prompt=“Press F8 for boot menu”, 0
pxe-service=X86PC, “Boot from network”, pxelinux
pxe-service=X86PC, “Boot from local hard disk”, 0
dhcp-range=10.0.0.210,proxy[/code]To:
[code]port=0
log-dhcp
tftp-root=/tftpboot
dhcp-boot=undionly.kpxe,10.0.0.210,10.0.0.210
dhcp-option=17,/images
dhcp-option=vendor:PXEClient,6,2b
dhcp-no-override
pxe-prompt=“Press F8 for boot menu”, 0
pxe-service=X86PC, “Boot from network”, undionly.kpxe
pxe-service=X86PC, “Boot from local hard disk”, 0
dhcp-range=10.0.0.210,proxy[/code]Then make a copy of the undionly.kpxe to undionly.kpxe.0
[code]sudo cp /tftpboot/undionly.kpxe /tftpboot/undionly.kpxe.0[/code][/quote]
But, there are zero packets sent from the FOG machine that are even assigning the next-boot server or boot file…
FOG sent two packets, both simply saying “File not found.” If dnsmasq were sending out additional IP configuration, we’d see a few more packets for DHCP, coming from FOG, Probably about 2 more packets.
So, DHCP must be telling the client to use 10.0.0.210 and pxelinux.0
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Yeeeeeessssss!!!
It’s finally working!!!I just did what TOM offered and it’s working!
thanks a lot guys!
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This post is deleted!
