Re: MASQ: failed TCP/UDP checksum

Keith Owens (
Sun, 29 Jun 1997 13:29:50 +1000

On Sat, 28 Jun 1997 14:13:07 -0500,
frostbyte <> wrote:
>sorry about the silly question but what does the following kernel
>message mean?
>gollumII kernel: MASQ: failed TCP/UDP checksum from!

A packet got corrupted between the source ( and your masq
box. One or two are normal, line noise, dodgy network cards etc. If
you get a lot it could be a problem with your PPP link. Some users
have reported problems with PPP compression options (especially VJ
header compression) where there is a mismatch between Linux and your
provider's terminal server. Disabling compression often helps. You
could run pppstats and check the error count, too high a value
indicates a line or protocol problem.