HP-UX Reference (11i v2 03/08) - 4 File Formats (vol 8)

ppp.Filter(4) ppp.Filter(4)

(‘ftp-data’) rather than the socket/protocol notation.

If your

/etc/services

ﬁle is missing some application-level protocols that you consider useful, you

can populate it with entries from the Assigned Numbers RFC, number 1340. For example, you may ﬁnd

it useful to add lines like

gopher 70/tcp

gopher 70/udp

kerberos 88/tcp

kerberos 88/udp

snmp 161/tcp

snmp 161/udp

nextstep 178/tcp

nextstep 178/udp

prospero 191/tcp

prospero 191/udp

x11 6000/tcp

if you’re using those applications, and if they’re not already in your

/etc/services

ﬁle as received

from your system’s manufacturer. If you augment your

/etc/services this way, then instead of using

entries like

pass !6000/tcp/syn/send

your

Filter could use entries like

pass !x11/syn/send

which is much more readable. A list of TCP and UDP service numbers and names, culled from the

Assigned Numbers RFC, is available in

Examples/services.ex

AUTHOR

ppp.Filter was developed by the HP.