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Old 02-01-2011, 11:04 AM
Abhishek Aggarwal
 
Default linux to windows Connectivity is slow

Hi All,
I am facing an issue in my organization. The issue is when i am trying to ping to windows 2003 standard 64 bit server i am getting the following response.
*
64 bytes from 172.17.0.19: icmp_seq=1 ttl=128 time=2.05 ms
64 bytes from 172.17.0.19: icmp_seq=2 ttl=128 time=0.229 ms
64 bytes from 172.17.0.19: icmp_seq=3 ttl=128 time=0.244 ms
64 bytes from 172.17.0.19: icmp_seq=4 ttl=128 time=0.227 ms
64 bytes from 172.17.0.19: icmp_seq=5 ttl=128 time=0.230 ms
64 bytes from 172.17.0.19: icmp_seq=6 ttl=128 time=0.222 ms
--- 172.17.0.19 ping statistics ---
6 packets transmitted, 6 received, 0% packet loss, time 4999ms
rtt min/avg/max/mdev = 0.222/0.535/2.058/0.681 ms

*
*
but when i am trying to ping any flavour of linux i am getting the following response
64 bytes from 172.17.0.11: icmp_seq=1 ttl=64 time=0.086 ms
64 bytes from 172.17.0.11: icmp_seq=2 ttl=64 time=0.075 ms
64 bytes from 172.17.0.11: icmp_seq=3 ttl=64 time=0.072 ms
64 bytes from 172.17.0.11: icmp_seq=4 ttl=64 time=0.073 ms
64 bytes from 172.17.0.11: icmp_seq=5 ttl=64 time=0.073 ms
64 bytes from 172.17.0.11: icmp_seq=6 ttl=64 time=0.092 ms
64 bytes from 172.17.0.11: icmp_seq=7 ttl=64 time=0.137 ms
--- 172.17.0.11 ping statistics ---
7 packets transmitted, 7 received, 0% packet loss, time 5999ms
rtt min/avg/max/mdev = 0.072/0.086/0.137/0.024 ms

*
I had checked by conecting the windows and linux servers through cross over cables and also the windows servers have also been formatted but still no conclusion is there
*sysctl -p is
net.ipv4.ip_forward = 0
net.ipv4.conf.default.rp_filter = 1
net.ipv4.conf.default.accept_source_route = 0
kernel.sysrq = 0
kernel.core_uses_pid = 1
net.ipv4.tcp_syncookies = 1
kernel.msgmnb = 65536
kernel.msgmax = 65536
kernel.shmmax = 4294967295
kernel.shmall = 268435456
net.ipv4.tcp_keepalive_time = 10
net.ipv4.tcp_keepalive_intvl = 10
net.ipv4.tcp_keepalive_probes = 2

*
This issue is creating a lots of problem in my working need your help
*
Thanks and Regards
*
Abhishek Agarwal

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Old 02-01-2011, 01:24 PM
"Mike Burger"
 
Default linux to windows Connectivity is slow

> Hi All,
> I am facing an issue in my organization. The issue is when i am trying to
> ping to windows 2003 standard 64 bit server i am getting the following
> response.
> *
> 64 bytes from 172.17.0.19: icmp_seq=1 ttl=128 time=2.05 ms
> 64 bytes from 172.17.0.19: icmp_seq=2 ttl=128 time=0.229 ms
> 64 bytes from 172.17.0.19: icmp_seq=3 ttl=128 time=0.244 ms
> 64 bytes from 172.17.0.19: icmp_seq=4 ttl=128 time=0.227 ms
> 64 bytes from 172.17.0.19: icmp_seq=5 ttl=128 time=0.230 ms
> 64 bytes from 172.17.0.19: icmp_seq=6 ttl=128 time=0.222 ms
> --- 172.17.0.19 ping statistics ---
> 6 packets transmitted, 6 received, 0% packet loss, time 4999ms
> rtt min/avg/max/mdev = 0.222/0.535/2.058/0.681 ms
>
> *
> *
> but when i am trying to ping any flavour of linux i am getting the
> following response
> 64 bytes from 172.17.0.11: icmp_seq=1 ttl=64 time=0.086 ms
> 64 bytes from 172.17.0.11: icmp_seq=2 ttl=64 time=0.075 ms
> 64 bytes from 172.17.0.11: icmp_seq=3 ttl=64 time=0.072 ms
> 64 bytes from 172.17.0.11: icmp_seq=4 ttl=64 time=0.073 ms
> 64 bytes from 172.17.0.11: icmp_seq=5 ttl=64 time=0.073 ms
> 64 bytes from 172.17.0.11: icmp_seq=6 ttl=64 time=0.092 ms
> 64 bytes from 172.17.0.11: icmp_seq=7 ttl=64 time=0.137 ms
> --- 172.17.0.11 ping statistics ---
> 7 packets transmitted, 7 received, 0% packet loss, time 5999ms
> rtt min/avg/max/mdev = 0.072/0.086/0.137/0.024 ms
>
> *
> I had checked by conecting the windows and linux servers through cross
> over cables and also the windows servers have also been formatted but
> still no conclusion is there
> *sysctl -p is
> net.ipv4.ip_forward = 0
> net.ipv4.conf.default.rp_filter = 1
> net.ipv4.conf.default.accept_source_route = 0
> kernel.sysrq = 0
> kernel.core_uses_pid = 1
> net.ipv4.tcp_syncookies = 1
> kernel.msgmnb = 65536
> kernel.msgmax = 65536
> kernel.shmmax = 4294967295
> kernel.shmall = 268435456
> net.ipv4.tcp_keepalive_time = 10
> net.ipv4.tcp_keepalive_intvl = 10
> net.ipv4.tcp_keepalive_probes = 2
>
> *
> This issue is creating a lots of problem in my working need your help
> *
> Thanks and Regards

My first thought is that the ping responses are still
sub-millisecond...what's the problem?

My second thought is that if there truly is an issue, it's in the network
tuning on the Windows systems, not on your Linux systems. Since your Linux
systems' response times are on the order of 1/3 the time of the response
times for the Windows systems, so it doesn't appear that your Linux
systems are the issue.

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Old 02-01-2011, 01:28 PM
 
Default linux to windows Connectivity is slow

> Missing name wrote:
>> Hi All,
>> I am facing an issue in my organization. The issue is when i am trying
>> to ping to windows 2003 standard 64 bit server i am getting the following
>> response.
<snip> *
>> --- 172.17.0.19 ping statistics ---
>> 6 packets transmitted, 6 received, 0% packet loss, time 4999ms
>> rtt min/avg/max/mdev = 0.222/0.535/2.058/0.681 ms
>> *
>> but when i am trying to ping any flavour of linux i am getting the
>> following response
<snip>
>> --- 172.17.0.11 ping statistics ---
>> 7 packets transmitted, 7 received, 0% packet loss, time 5999ms
>> rtt min/avg/max/mdev = 0.072/0.086/0.137/0.024 ms

Are the Linux/Linux pings going through the same switch? What does
traceroute give you?

mark

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