topic Re: icmp: unknown protocol in Operating System - HP-UX

icmp: unknown protocol

Thamm — Fri, 28 Nov 2003 05:15:50 GMT

Hi,
I get the following message on an 11.11 system:

ping "Servername"
icmp: unknown protocol

What to do?

Regards,
Stefan

Re: icmp: unknown protocol

Elmar P. Kolkman — Fri, 28 Nov 2003 05:20:55 GMT

Check your /etc/protocols file I guess.

Re: icmp: unknown protocol

Thamm — Fri, 28 Nov 2003 05:26:57 GMT

Hi,
file /etc/protocols:
# Internet (IP) protocols
#
ip 0 IP # internet protocol, pseudo protocol number
icmp 1 ICMP # internet control message protocol
igmp 2 IGMP # internet group management protocol
ggp 3 GGP # gateway-gateway protocol
tcp 6 TCP # transmission control protocol
egp 8 EGP # exterior gateway protocol
pup 12 PUP # PARC universal packet protocol
udp 17 UDP # user datagram protocol
hmp 20 HMP # host monitoring protocol
xns-idp 22 XNS-IDP # Xerox NS IDP
rdp 27 RDP # "reliable datagram" protocol

Seems to be OK.

Re: icmp: unknown protocol

Jean-Louis Phelix — Fri, 28 Nov 2003 05:27:55 GMT

I agree with Elmar. If this file is correct, you can also try to add "protocols: file" to your /etc/nsswitch.conf file.

Regards.

Re: icmp: unknown protocol

Elmar P. Kolkman — Fri, 28 Nov 2003 05:38:39 GMT

Since your /etc/protocols file looks fine to me, check out if it is being used... nsswitch.conf is the file that should be in. I've tested and if that is incorrect it gives exactly the message you get...

Re: icmp: unknown protocol

Thamm — Fri, 28 Nov 2003 06:22:40 GMT

Hi,
I changed the entry in
/etc/nsswitch.conf
from
protocols: nis [NOTFOUND=return TRYAGAIN=continue] files
to
protocols: files [NOTFOUND=continue] nis

Now it works fine!!
Thank you.
Have a nice weekend with no server-problems.

Stefan.