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тАО09-14-2000 12:23 PM
тАО09-14-2000 12:23 PM
IP Fragment
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тАО09-14-2000 12:33 PM
тАО09-14-2000 12:33 PM
Re: IP Fragment
Have you ruled-out "reverse-name-lookup". Making sure that your device's name is represented in the DNS tables of the DNS server can eliminate timeout delays.
Reverse lookup is the process by which a server receiving a request for service from a remote machine ascertains whether the identity claimed by the machine is in fact its true one. The process goes like this:
1. The request arrives in a packet with an IP address indicating the point of origin.
2. The server queries name service on the net to find out what host name is associated with that IP address.
3. The server then queries name service to find out what IP address is associated with that host-name.
4. If this last request fails to find an IP address, or finds one that doesn't match the original, the request for service is rejected.
For an good description of reverse name lookup, see:
http://www.helpdesk.umd.edu/comm/ethernet/revlook.shtml
...JRF...
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тАО09-14-2000 12:44 PM
тАО09-14-2000 12:44 PM
Re: IP Fragment
get lsof at
http://hpux.cs.utah.edu/hppd/hpux/Sysadmin/lsof-4.48/
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тАО09-14-2000 12:45 PM
тАО09-14-2000 12:45 PM
Re: IP Fragment
When you are transmitting IP packets, they are (or can be)broken down into "fragments" based on different MTU sizes over its travel. Memory is reserved for these "fragments" to be re-assembled into the fully assembled packet.
It is very possible, if this parameter is set too high, for so much memory to be used in fragmentation re-assembly that you start having memory pressure on your system which in turn can slow things down. Default is 10% of memory.
Tony
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тАО09-14-2000 12:52 PM
тАО09-14-2000 12:52 PM
Re: IP Fragment
Is the behavior consistent? Do the same workstations show slow connections every time?
If so, try telneting to the IP rather than the hostname, if the connection is fast then you have a name resolution problem on the workstation(s).
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тАО09-14-2000 01:00 PM
тАО09-14-2000 01:00 PM
Re: IP Fragment
With regard to the kernel's 'netmemmax' as Tony mentioned, see document #S3100006392A.
...JRF...