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Network Troublshooting => Linux Servers Support => Topic started by: ashishraj on August 30, 2007, 06:43:44 AM

Title: Neighbour Table Overflow
Post by: ashishraj on August 30, 2007, 06:43:44 AM

i have fedora core2
i faced new prob.
"printk:3004 messeges suppressed
Neighbour table overflow "

and my server rejects nodes...
they cant serf.

plz solve this.

Title: Re: Neighbour Table Overflow
Post by: Ricky on September 01, 2007, 12:46:25 PM

It is related to your network setup..you machine is unable to determine who is who.
Can you tell me eth setup or your machine.. including netmask.

Title: Re: Neighbour Table Overflow
Post by: ashishraj on September 02, 2007, 06:46:09 AM

sure Ricky
i m using fedora core 2

eth0 = 10.20.114.214 / 255.255.128.0 (isp)
eth1 = 192.168.1.1 /255.255.255.0 (my local network)
ppp0 (xDSL) = assigned by DHCP

i use NAT + squid transparent proxy as per ur saying...
http://www.linuxsolved.com/linux-forums/linux-tutorials-how-tos/configuring-squid-proxy-server-transparent-proxy-t116.0.html (http://www.linuxsolved.com/linux-forums/linux-tutorials-how-tos/configuring-squid-proxy-server-transparent-proxy-t116.0.html)
Ricky u want my squid.conf for more info.?

Title: Re: Neighbour Table Overflow
Post by: Ricky on September 02, 2007, 01:38:24 PM

As far as I know .. this problem is related to netmask
Try changing eth0 's netmask to
255.255.255.0

Don't worry it will work .

Title: Re: Neighbour Table Overflow
Post by: ashishraj on September 05, 2007, 05:19:09 AM

Ricky as per u say i done it but problem is still running...
after that i done eth0 on DHCP (auto) than after problem is still running....
i remake my squid but no result...

plz.. tell me what is the reson of that
this prob. accured after 1 year of successfully run FC2

plz... solved my prob.

Title: Re: Neighbour Table Overflow
Post by: Ricky on September 06, 2007, 11:21:59 AM

You can also increase threshold values at :
/proc/sys/net/ipv4/neigh/default/

there must be three files namely..
gc_thresh1
gc_thresh2
gc_thresh3

see their current value and try to raise it (multiple of 8) .. say if 128 then try 256 .

Though this is not the preferred, I feel there must be some misconfiguration or very large number of machines on netwrk.

Title: Re: Neighbour Table Overflow
Post by: ashishraj on September 06, 2007, 12:21:58 PM

i already done that thresh1,2,3....128,256,1024
but no result
only 25 pc on my network..
 ???

Title: Re: Neighbour Table Overflow
Post by: ashishraj on September 08, 2007, 08:28:37 AM

Ricky
any solution of this ?

Title: Re: Neighbour Table Overflow
Post by: Ricky on September 08, 2007, 10:55:38 AM

Try isolating your network from internet ie. your ISPs and then see.