iptables: user-def'd chains: allowed names?

pp. 187-8 of _Linux Firewalls_, 3rd ed (Suehring and Ziegler):

"User-defined chain names can be up to 30 characters in length.
"User-defined chain names can contain hyphens (-) but not underscores (_)."

Are those both true? I did a reasonably thorough WWW and USENET search on
the second, and came up with no evidence for it ("no underscores")
whatsoever.

TIA



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"jqpx37" <(E-Mail Removed)> said:
>pp. 187-8 of _Linux Firewalls_, 3rd ed (Suehring and Ziegler):
>
>"User-defined chain names can be up to 30 characters in length.
>"User-defined chain names can contain hyphens (-) but not underscores (_)."
>
>Are those both true? I did a reasonably thorough WWW and USENET search on
>the second, and came up with no evidence for it ("no underscores")
>whatsoever.

I have some chains with names containing underscores, so works with
at least some versions. But perhaps works only by luck.
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