Confusion about ident sameuser

Hi All,

I am confused with the 'ident sameuser' authentication. Here's my
setup:

[postgres(at)db2 ~]$ grep -v "^#" <data_dir>/pg_hba.conf
local all all ident sameuser
host all all 127.0.0.1/32 ident sameuser
host all all 10.0.0.0/8 password

[postgres(at)db2 ~]$ pg_ctl -D <data_dir> reload

[postgres(at)db2 ~]$ psql -h 10.10.0.27 -p 6543 -d postgres -U postgres
Password for user postgres:

[postgres(at)db2 ~]$ psql -p 6543 -d postgres -U postgres
Welcome to psql 8.1.11, the PostgreSQL interactive terminal.

[postgres(at)db2 ~]$ psql -h localhost -p 6543 -d postgres -U postgres
psql: FATAL: Ident authentication failed for user "postgres"

As you can see, if I use the machine's interface or unix sockets, it either
asks for password or lets me in. But when I use localhost, it correctly uses
127.0.... line for authentication, but does not let me in!!!

Is this not supposed to work? Could it be because I might not be having an
ident server running on my box? How do I determine if I have an ident server
running?

Thanks in advance,

--
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