netdev - Re: [iproute2 net-next] ip route: Add RTM_F_LOOKUP

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Message-ID: <56007695.3070003@cumulusnetworks.com>
Date:	Mon, 21 Sep 2015 15:28:53 -0600
From:	David Ahern <dsa@...ulusnetworks.com>
To:	Stephen Hemminger <stephen@...workplumber.org>
Cc:	netdev@...r.kernel.org
Subject: Re: [iproute2 net-next] ip route: Add RTM_F_LOOKUP_TABLE flag and
 show table id

On 9/21/15 3:19 PM, Stephen Hemminger wrote:
>> @@ -1638,6 +1638,8 @@ static int iproute_get(int argc, char **argv)
>>   	if (req.r.rtm_family == AF_UNSPEC)
>>   		req.r.rtm_family = AF_INET;
>>
>> +	req.r.rtm_flags |= RTM_F_LOOKUP_TABLE;
>> +
>>   	if (rtnl_talk(&rth, &req.n, &req.n, sizeof(req)) < 0)
>>   		exit(2);
>>
>
> How will this work (or not) on older kernels?
>

It works just fine. First test used the wrong VM and was puzzled to not 
see the table id in the output. Then I realized the older kernel did not 
recognize the RTM_F_LOOKUP_TABLE; silently ignores the flag. With a 
kernel that does recognize it I get the table id in the output when it 
is not main.

David
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