[OLSR-users] Routes momentarily disappearing

[Karl Hiramoto]

Hi all,   I'm hoping someone has a suggestion for my problem.

>From one of my nodes on my olsrd network, i have a problem with broken
connections/ outages that last a few seconds.  There becomes a short period of
time where "network is unreachable" to the Internet

Anyone suggest i use hysteresis instead of linkQuality?  Any other suggestions
to fix my problem?


For example my problem is with a node with the ip of 10.69.1.26


(spam-protected):~# ping 192.168.1.1; route -n ;sleep 5; route -n
PING 192.168.1.1 (192.168.1.1): 56 data bytes
64 bytes from 192.168.1.1: icmp_seq=0 ttl=253 time=24.1 ms
64 bytes from 192.168.1.1: icmp_seq=1 ttl=253 time=6.5 ms
64 bytes from 192.168.1.1: icmp_seq=2 ttl=253 time=6.4 ms
<snip>
64 bytes from 192.168.1.1: icmp_seq=266 ttl=253 time=7.7 ms
64 bytes from 192.168.1.1: icmp_seq=267 ttl=253 time=38.7 ms
ping: sendto: Network is unreachable

// here no route to internet

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
10.69.1.38      0.0.0.0         255.255.255.255 UH    1      0        0 eth1
10.69.1.20      10.69.1.10      255.255.255.255 UGH   2      0        0 eth1
10.69.1.37      10.69.1.38      255.255.255.255 UGH   1      0        0 eth1
10.69.1.11      10.69.1.38      255.255.255.255 UGH   2      0        0 eth1
10.69.1.10      0.0.0.0         255.255.255.255 UH    1      0        0 eth1
10.69.1.15      10.69.1.10      255.255.255.255 UGH   2      0        0 eth1
10.69.1.31      0.0.0.0         255.255.255.255 UH    1      0        0 vlan0
10.69.1.14      10.69.1.38      255.255.255.255 UGH   2      0        0 eth1
10.69.1.12      10.69.1.38      255.255.255.255 UGH   2      0        0 eth1
10.69.0.0       0.0.0.0         255.255.0.0     U     0      0        0 vlan0
10.69.0.0       0.0.0.0         255.255.0.0     U     0      0        0 eth1

///  Then 5 seconds later it is fine again:

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
10.69.1.38      0.0.0.0         255.255.255.255 UH    1      0        0 eth1
10.69.1.20      10.69.1.10      255.255.255.255 UGH   2      0        0 eth1
10.69.1.37      10.69.1.38      255.255.255.255 UGH   1      0        0 eth1
10.69.1.11      10.69.1.38      255.255.255.255 UGH   2      0        0 eth1
10.69.1.10      0.0.0.0         255.255.255.255 UH    1      0        0 eth1
10.69.1.9       10.69.1.10      255.255.255.255 UGH   1      0        0 eth1
10.69.1.15      10.69.1.10      255.255.255.255 UGH   2      0        0 eth1
10.69.1.31      0.0.0.0         255.255.255.255 UH    1      0        0 vlan0
10.69.1.14      10.69.1.38      255.255.255.255 UGH   2      0        0 eth1
10.69.1.12      10.69.1.38      255.255.255.255 UGH   2      0        0 eth1
10.69.0.0       0.0.0.0         255.255.0.0     U     0      0        0 vlan0
10.69.0.0       0.0.0.0         255.255.0.0     U     0      0        0 eth1
0.0.0.0         10.69.1.38      0.0.0.0         UG    2      0        0 eth1


--------- MY olsrd.conf   config-----------
DebugLevel      0
IpVersion       4
Hna4
{
}

AllowNoInt      yes
IpcConnect
{
     MaxConnections  1
     Host            127.0.0.1
}

UseHysteresis   no
Pollrate        0.05

LinkQualityLevel        2
LinkQualityWinSize      60

Interface "eth1" "vlan0"
{

    Ip4Broadcast                255.255.255.255
}
---------- end of config--------



A picture of my topology is here:
http://karl.hiramoto.org/temp/pics/topology-2005Nov25.png

With more packet loss:
http://karl.hiramoto.org/temp/pics/topology-2005Nov25b.png
With this packet loss here between 10.1.69.26 and 10.1.69.10 is the reason why i
made the  "LinkQualityWinSize      60".    With the larger LinkQualityWinSize I
found routs to not switch as often which is better for me. 192.168.1.1 is
actually two different DSL modems.


>From 10.69.1.12  I can ping 10.1.69.26 for  hours and only get 1% packet loss.
 However  from 10.1.69.26  i can not ping 192.168.1.1 (internet gateway)
without loosing connectivity for more than a few minutes.


I am using Olsrd 0.4.9  on  openwrt linux.


Thanks,

-- 

---
Karl Hiramoto <(spam-protected)>  http://karl.hiramoto.org/
Yahoo_IM = karl_hiramoto  GTalk=(spam-protected)
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