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Linux - Networking This forum is for any issue related to networks or networking.
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Old 10-08-2010, 10:17 AM   #1
evilted
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Registered: Aug 2009
Location: Ouagadougou, Burkina Faso
Distribution: centos
Posts: 92

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connection lost to gateway?


recently i have combined 2 machines into 1. after doing this, the ping to the new machine stops, for no apparent reason, and consequently all traffic to/from the machine also stops. when using the two machines individually this never happened.

one time the ping goes like this :
Code:
Reply from 10.10.1.254: bytes=32 time<1ms TTL=64
Reply from 10.10.1.254: bytes=32 time<1ms TTL=64
Reply from 10.10.1.19: Destination host unreachable.
Reply from 10.10.1.19: Destination host unreachable.
Reply from 10.10.1.19: Destination host unreachable.
Reply from 10.10.1.19: Destination host unreachable.
Reply from 10.10.1.19: Destination host unreachable.
Reply from 10.10.1.254: bytes=32 time=999ms TTL=64
Reply from 10.10.1.254: bytes=32 time<1ms TTL=64
Reply from 10.10.1.254: bytes=32 time<1ms TTL=64
another time it wont drop the packet, but the ping is huge...
Code:
Reply from 10.10.1.254: bytes=32 time<1ms TTL=64
Reply from 10.10.1.254: bytes=32 time<1ms TTL=64
Reply from 10.10.1.254: bytes=32 time=1001ms TTL=64
Reply from 10.10.1.254: bytes=32 time<1ms TTL=64
Reply from 10.10.1.254: bytes=32 time<1ms TTL=64

also after a long time, (2-3 days) i get 'neighbor table overflow' listed in the console of the machine. i have increased the gc_timeout or whatever, and this does supress the warning, but my problem is still there. the neighbor table overflow, in my understanding is only a problem with a large number of hosts (for default sysctl parameters).

Lastly, if i restart the network, it kills everything (like the network just wont restart - it reaches the last interface and hangs), and if i reboot the machine, it seems to be fine for about 3-4hours.

has anyone seen anything like this when connecting a large number of hosts to 1 gateway, using linux as the router?

Last edited by evilted; 10-08-2010 at 10:20 AM. Reason: added information
 
Old 10-15-2010, 03:44 PM   #2
juan10dan
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Registered: Jun 2010
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What do you mean by combining the machines??
 
Old 10-18-2010, 02:02 AM   #3
evilted
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Registered: Aug 2009
Location: Ouagadougou, Burkina Faso
Distribution: centos
Posts: 92

Original Poster
Rep: Reputation: 18
Sorry for not being clearer; by combining: i mean i took all the ip's from one machine and added them to the other (most of the machines i use are nothing but glorified routers).

I should mark this as solved, because shortly after posting this thread I realized i had an error in iptables: i was continuously filling conntrack, and ive now learnt that when it reaches its limit everything comes to a grinding halt!
 
  


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