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On Mon, 2006-06-26 at 16:16 -0500, mjinks@××××××××.edu wrote: |
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> We have a big old Dell running RedHat, which does nothing (any more) but |
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> serve DHCP for a number of labs around our campus. We thought it would |
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> be an ideal candidate for replacement with a home-rolled GNAP machine |
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> using dnsmasq's DHCP service. |
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[ snip ] |
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> A little tcpdumping shows some differences between the old (RedHat) box |
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> and the new (GNAP) system. In this example, "msfc-ri-v17.uchicago.edu" |
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> is the router which serves our DHCP client; "dell-test-03.uchicago.edu" |
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> is the DHCP client; and "bonzai.uchicago.edu" houses the DHCP server. |
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> tcpdump is running on bonzai: |
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> |
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> 14:42:27.985373 msfc-ri-v17.uchicago.edu.bootps > bonzai.uchicago.edu.bootps: (request) hops:1 xid:0x20dcf2e1 secs:4 flags:0x8000 G:msfc-ri-v17.uchicago.edu ether 0:f:1f:dc:f2:e1 [|bootp] |
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> 14:42:27.986066 bonzai.uchicago.edu.bootps > msfc-ri-v17.uchicago.edu.bootps: (reply) hops:1 xid:0x20dcf2e1 secs:4 flags:0x8000 Y:dell-test-03.uchicago.edu S:bonzai.uchicago.edu G:msfc-ri-v17.uchicago.edu ether 0:f:1f:dc:f2:e1 [|bootp] (DF) |
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> |
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> Now here's an example of the same case, except that the hardware acting |
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> as bonzai.uchicago.edu is now our GNAP machine: |
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> |
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> 01:06:27.601181 IP msfc-ri-v17.uchicago.edu.bootps > bonzai.uchicago.edu.bootps: BOOTP/DHCP, Request [|bootp] |
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> |
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> The GNAP box doesn't issue a response, apparently because it can't see |
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> that the request is coming from one of its listed DHCP clients. |
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Have you tried running dhcpd on the GNAP box? |
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> So, does anybody know what might be going on here? I don't think that |
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> dnsmasq is (necessarily) the culprit, since tcpdump shows more |
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> information in the case of the packets dumped on the RedHat machine. |
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To me it looks like its dnsmasq. The request packet arrives to your GNAP |
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box but dnsmasq is never responding. |
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> Is |
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> this a difference, maybe, in the uclibc network handling? Do I need to |
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> tweak my kernel? Am I just crazy? |
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> |
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> Thanks for any thoughts. |
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|
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Try this one: |
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http://thekelleys.org.uk/dnsmasq/docs/FAQ |
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Look for this part: |
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Q: This new DHCP server is well and good, but it doesn't work for me. |
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What's the problem? |
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-- |
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Natanael Copa |
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-- |
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