Re: Default Gateway for a system v/s Default gateway per Interface

[Ratan Gupta <ratagupt@linux.vnet.ibm.com>]

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Thanks Patrick, William for sharing the feedbacks

I will start working on the changes.


On 4/24/20 11:15 PM, William Kennington wrote:
> Sounds good to me, we have needed this for a long time because the 
> current gateway configuration breaks our v6 stack with multiple NICs.
>
> On Fri, Apr 24, 2020 at 8:21 AM Patrick Williams <patrick@stwcx.xyz 
> <mailto:patrick@stwcx.xyz>> wrote:
>
>     On Fri, Apr 24, 2020 at 08:36:26PM +0530, Ratan Gupta wrote:
>     > ~~~~~~~~~~~~~
>     > Kernel IP routing table
>     > Destination     Gateway         Genmask         Flags MSS
>     Window  irtt
>     > Iface
>     > 0.0.0.0         19.168.2.1      0.0.0.0         UG 0 0          0
>     > eth0
>     > 0.0.0.0         10.10.10.1      0.0.0.0         UG 0 0          0
>     > eth1
>     > ~~~~~~~~~~~~~~
>     >
>     > Kernel will first try using the default gateway having higher
>     metric
>     > value and then fall back to the lower.
>
>     I'm not seeing us with an interface to adjust the metric for an
>     interface.  I think we need to add that at the same time?
>
Not now, As per my testing if metric value is not defined and both the 
routes

having same metric then kernel tries one after other. We can bring the 
metric

later.

>     Otherwise, I
>     don't think we have a way to specify which interface
>     outside-the-subnet
>     should go (vs today we can set the default-gateway to the desired
>     interface's gateway).
>     -- 
>     Patrick Williams
>

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