hi guys

my laptop have 2 NIC attach it, the cable NIC and Wireless NIC, the cable one connect to my lab network environment and the Wireless connect to office network environment (connect to internet) which both have differen segments

let say my lab environment have following segment
10.10.10.0 --> my Laptop segment
20.20.20.0 --> Router 1
30.30.30.0 --> Router 2

and my office segment is
172.16.1.0

when my Wireless was turn off my pc can ping to all segment on my lab network environment, but if the wireless was turn on, i cant ping to others segment but only my laptop segment and i still could surfing to the internet without any problem.

then i tried to add a new route from my laptop using "route add x.x.x.x mask x.x.x.x (gateway)" in command line and after that i can ping back to all segment in my lab network environment eventhough my wireless was on

my question is, why i have to create a manual route into my laptop so that i can have connection between my laptop and my lab environment in the condition my wireless turn on ??

need explanation about it guys

Without a specific route the laptop could only go by default route.
This was via the wireless, so either no default route on the wired nic, or the wireless "won" the routing decision for some reason.

is there any specific reason why the wireless could be won the routing decision from the wired one??

anyway thanks for the explanation,,,,

You should only have a single default gateway. Take the default gateway off the NIC that doesn't connect to the internet

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When you are using two NICs like that, there a a few different factors that determine which default gateway would get used (based on OS), but in general the best practice is to always use one default gateway and for the second NIC use static routes or keep all of the devices on the same network so routing isn't needed.

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I don't have a signature.

what if i want to user those both NIC but with different gateway (one to internet and one to my lab) ??

couse when i tried to put defferent gateway to each NIC, i cant access internet, but if i set no gateway on my NIC that connect to my LAB, i able to access the internet, whereas i really expected that both NIC can running well simultaneously

any suggestion guys

Then you use a static route to point to the lab and next-hop

You still only should have a single default gateway

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www.mellowd.co.uk/ccie/

you can use static routes to determine which default gateway to use

so if you want to access network 70.0.0.0 though gateway1 and network 20.0.0.0 through gateway2
create static routes for the correct next hop depending on destination network

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"If you're good at anticipating the human mind. It leaves nothing to chance."
-Jigsaw

fixed

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www.mellowd.co.uk/ccie/