[Dnsmasq-discuss] DHCP Issue

Matthias Andree matthias.andree at gmx.de
Sun Jul 22 18:06:12 BST 2007

Simon Kelley <simon at thekelleys.org.uk> writes:

> Steven wrote:
>> Many thanks!!!
>> I disabled checksum offload with this command:
>> sudo ethtool -K eth0 rx off tx off
>> and now everything works... :)
> Good to find it.
> That explains the discrepancy between ISC dhcpd and dnsmasq too. dhcpd
> will be calculating the checksum itself and sending raw packets, thus
> avoiding the broken hardware. dnsmasq trusts the kernel, and gets
> bitten......

Perhaps the issue should be reported to the driver's maintainer, so that
the corresponding hardware can be blacklisted versus checksum
offloading, lest other fall into the same pit...

Matthias Andree

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