From: Jay Vosburgh <jay.vosburgh@canonical.com>
To: lartc@vger.kernel.org
Subject: Re: rp_filter
Date: Fri, 13 Jul 2018 16:26:27 +0000 [thread overview]
Message-ID: <6814.1531499187@nyx> (raw)
In-Reply-To: <1531495407677.43982@datavoiceint.com>
Grant Taylor <gtaylor@tnetconsulting.net> wrote:
>On 07/13/2018 09:23 AM, Leroy Tennison wrote:
>> Is there a definitive way to tell that rp_filter is dropping traffic (in
>> this case echo request) other than disabling it and seeing the expected
>> traffic (echo reply)? I tried an iptables packet trace but I either did
>> it wrong or it showed nothing. The only indications I have right now
>> are:
>
>Check dmesg. That's the most reliable place I've seen for logs about (so
>called) "martian" packets.
I believe they're also counted in the "in_martian_src" column of
/proc/net/stat/rt_cache.
-J
>> No firewall rules blocking traffic but no replies either.
>
>It seems like reverse path filtering operates at a lower layer before
>IPTables.
>
>> The problem is subnet-specific (only occurs on a directly-connected
>> subnet).
>
>Odd.
>
>
>
>--
>Grant. . . .
>unix || die
---
-Jay Vosburgh, jay.vosburgh@canonical.com
next prev parent reply other threads:[~2018-07-13 16:26 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-13 15:23 rp_filter Leroy Tennison
2018-07-13 16:23 ` rp_filter Grant Taylor
2018-07-13 16:26 ` Jay Vosburgh [this message]
2018-07-13 18:03 ` rp_filter Leroy Tennison
2018-09-04 10:11 ` rp_filter Anton Danilov
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