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N/w parameters Tuning

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S.S.
Super Advisor

N/w parameters Tuning

Hi All,

For auditing purpose, HP has recommended us the following N/w tunable parameters

tcp_syn_rcvd_max
4096
arp_cleanup_interval
60000
ip_forward_src_routed
0
ip_forward_directed_broad
casts
0
ip_respond_to_timestamp
0
ip_respond_to_timestamp_
broadcast
0
ip_respond_to_address_ma
sk_broadcast
0
ip_respond_to_echo_broad
cast
0
ip_forwarding
0
ip_send_redirects
0

when i have checked the /etc/rc.config.d/nddconf file i am able to see the following parameters and those parameters are also commented.

# Example 1: Change the interval for sending the first keepalive probes
# for idle TCP connection to one hour
# TRANSPORT_NAME[0]=tcp
# NDD_NAME[0]=tcp_keepalive_interval
# NDD_VALUE[0]=3600000
#
#
# Example 2: Change the interval for sending keepalive probes to 1 minute
# when TCP is detached. (e.g.FIN_WAIT_2)
# TRANSPORT_NAME[1]=tcp
# NDD_NAME[1]=tcp_keepalive_detached_interval
# NDD_VALUE[1]=60000
#
#
# Example 3: Change the amount of time TCP endpoints persist in TIME_WAIT
# state to 30 seconds.
# TRANSPORT_NAME[2]=tcp
# NDD_NAME[2]=tcp_time_wait_interval
# NDD_VALUE[2]=30000
#
# Example 4: Change the UDP default ttl parameter to 128
# TRANSPORT_NAME[3]=udp
# NDD_NAME[3]=udp_def_ttl
# NDD_VALUE[3]=128
#
# Example 5: Change the amount of time that ARP entries can stay in
# ARP cache to 10 minutes.
#
# TRANSPORT_NAME[4]=arp
# NDD_NAME[4]=arp_cleanup_interval
# NDD_VALUE[4]=600000


May i know how can we set the other parameters into the configuration file. After parameters are added whether we have to stop and start any service?

May i know the impact if we add the above parameters.

My OS version is HP-UX 11.11
OS models: rp8440, rp7440 and rp3440
5 REPLIES
Johnson Punniyalingam
Honored Contributor

Re: N/w parameters Tuning

Check . Below Thread and the comments from

>>Bill Hassell<<

http://forums11.itrc.hp.com/service/forums/questionanswer.do?threadId=744441
Problems are common to all, but attitude makes the difference
Johnson Punniyalingam
Honored Contributor

Re: N/w parameters Tuning

More information on the below thread

http://forums11.itrc.hp.com/service/forums/questionanswer.do?admit=109447626+1264066952720+28353475&threadId=53812
Problems are common to all, but attitude makes the difference
Johnson Punniyalingam
Honored Contributor

Re: N/w parameters Tuning

>>>when i have checked the /etc/rc.config.d/nddconf file i am able to see the following parameters and those parameters are also commented.<<<

meaning ..you are non-compliance for the auditing issues,raised by HP
hence non of the "nddconf" or network parameter are in USE. becoz they are commented

if you there are in "USE" to need to tune according to the requirement from HP recommendations
Problems are common to all, but attitude makes the difference
Jupinder Bedi
Respected Contributor
Solution

Re: N/w parameters Tuning

you can change the parameters either by using ndd command or by editing or by editing /etc/rc.config.d/nddconf file and if these parameters are recommended by HP than go a head , it will not harm your system.
All things excellent are as difficult as they are rare
Jupinder Bedi
Respected Contributor

Re: N/w parameters Tuning

here is the example for changing your first parameter

ndd -set /dev/tcp tcp_syn_rcvd_max 4096

Good Luck
All things excellent are as difficult as they are rare