On Friday 21 November 2003 8:15 pm, Leonid Veytser wrote:
> A general question about checksumming. If I change the destination address
> in the IP header, then of course I need to recalculate the IP header
> checksum.
"You" the user (or system administrator) do not need to recalculate any
checksums - the SNAT or DNAT code does this for you.
> But do I have to recalculate the checksum of the next protocol
> header (ie TCP, UDP, etc)?
No. Everything is handled for you in the background. Anyway, if you only
change the IP address (source and/or destination), the TCP or UDP checksum
remains valid.
Antony.
--
Feeling bad at breakfast because you don't have a hangover is evidence of a
complex emotional life it can take many years to perfect.
- Pete McCarthy, The Road to McCarthy
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