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тАО07-15-2002 05:41 AM
тАО07-15-2002 05:41 AM
I changed the addresses to our netport print servers on our HP-9000 HP-UX 11.0. I did an arp -a and the old addresses are still associated with the MAC address. How do I refresh the arp table in HP-UX 11.0 to recognize the IP addresses changes.
Attilio
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тАО07-15-2002 05:44 AM
тАО07-15-2002 05:44 AM
Re: Old IP addresses appear in arp table after changes
Do an arp -d command to delete the old entry, then ping the new entry and the arp table will update with the new one.
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тАО07-15-2002 05:48 AM
тАО07-15-2002 05:48 AM
Re: Old IP addresses appear in arp table after changes
arp -d to delete the old entry. Once you ping the new ip address it will appear in the arp table.
Piyush
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тАО07-15-2002 05:51 AM
тАО07-15-2002 05:51 AM
Re: Old IP addresses appear in arp table after changes
# /usr/sbin/arp -s hostname hw_address
This will update the arp table.
Piyush
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тАО07-15-2002 05:52 AM
тАО07-15-2002 05:52 AM
Re: Old IP addresses appear in arp table after changes
arp has a cache which remembers the information stored into it.( I think for 5 minutes) You first have to delete these informations using the command:
arp -d
After this the new IP- adresses will appear in arp cache, if you try to establish any connection to remote host.
Allways stay on the bright side of life!
Peter
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тАО07-15-2002 06:45 AM
тАО07-15-2002 06:45 AM
Re: Old IP addresses appear in arp table after changes
I did an arp -d {IP address}. I do an arp -a
the entry does not exist. I ping the hostname of the printer and the ping comes back with the old IP address. The /etc/hosts file is correct.
Attilio
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тАО07-15-2002 07:50 AM
тАО07-15-2002 07:50 AM
Re: Old IP addresses appear in arp table after changes
What about changing the IP address on the printer server itself. Did you try with the arp -s command with the hostname and mac-address ???
Check the IP address if it exists in the /etc/rc.config.d/netconf file also
Piyush
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тАО07-15-2002 08:10 AM
тАО07-15-2002 08:10 AM
Re: Old IP addresses appear in arp table after changes
The IP addresses on the print servers are correct. If I do an arp -d the IP and MAC addreses are correct. When I ping the device using the alias I get the old IP address.
Attilio
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тАО07-15-2002 09:12 AM
тАО07-15-2002 09:12 AM
SolutionThe temporary fix is to add the arp entry manually with "arp -s hostname mac". Depending on your broadcast timer from arpd this may not last long.
Usually a router takes care of the arpd server and your workstation is a client.
You need to flush the arp table on your device pushing arp entries.
If it's a router and yours then the easy way is to power cycle it. If it's not yours then have the network admin take care of it.
Note: I have seen sites (and done so myself) where arp tables are manually loaded at system boot time. Hopefully this is not your case.
Regards,
Shannon
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тАО07-15-2002 06:36 PM
тАО07-15-2002 06:36 PM
Re: Old IP addresses appear in arp table after changes
That the ping of a hostname comes back with the old IP address implies that the hostname to IP mappings did not get updated.