How to increase ping reply for external domains

niharikaananth · 04-03-2012, 09:58 AM

Hi..All,
We have 2 WAN, one is limited plan and other one is unlimited. I always wanted to prefer to use only unlimited line for LAN users. So if is it possible to flow some huge traffic on particular LAN card then I can write a shell script which based on ping reply and which should automatically change the connection if any one of the WAN speed goes down. As I have seen since many months, while we are in WAN1 the internet will be slow whenever ping reply goes above 300ms, and for WAN2 the internet will be very slow whenever ping reply goes above 500ms.

I searched through the internet to flow huge traffic on particular LAN card but nowhere could found the solution. So I came here and hope someone will definitely help me in this.

This is enough if I could to flow some huge traffic on particular LAN card to increase the ping reply for external domains and the rest I can achieve.

Thanks in advance for your kind help.

Tinkster · 04-03-2012, 01:18 PM

Can you try to describe your infrastructure in a meaningful way?

WAN1 & WAN2 may mean something to you, but to get a sensible
response we'll need to kow IP ranges, routing tables, ...

Cheers,
Tink

P.S.: Moving this over to networking for obvious reasons.

niharikaananth · 04-03-2012, 09:19 PM

Thanks for your kind reply Tinkster.
Okay I request you to forget about WAN1 and WAN2. I have a PC at my home which is having only one LAN card and it is directly connected to cable modem. If I ping to google.com usually I will get the ping reply time as below 50 or 60miliseconds at this time internet speed also will be good. Please see below

Code:

$ping -c 5 google.com
PING google.com (some_IP_address) 56(84) bytes of data.
64 bytes from *somedomain*.net (some_IP_address): icmp_req=1 ttl=55 time=42.1 ms
64 bytes from *somedomain*.net (some_IP_address): icmp_req=2 ttl=55 time=41.9 ms
64 bytes from *somedomain*.net (some_IP_address): icmp_req=3 ttl=55 time=44.8 ms
64 bytes from *somedomain*.net (some_IP_address): icmp_req=4 ttl=55 time=42.8 ms
64 bytes from *somedomain*.net (some_IP_address): icmp_req=5 ttl=55 time=43.4 ms

--- google.com ping statistics ---
5 packets transmitted, 5 received, 0% packet loss, time 4005ms
rtt min/avg/max/mdev = 41.979/43.051/44.877/1.081 ms

Sometimes the ping reply time will be above 500ms, and at that time internet speed also will be very slow.
So my request is that is it possible to increase the ping reply time by manually flowing some huge traffic on this LAN card even while ping reply time is below 50ms?
If yes and could you please show that how to increase the ping reply time?