netdev - Re: mtu issue with ipsec tunnel and netfilter snat

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Message-ID: <alpine.LNX.2.01.1301091050370.20022@nerf07.vanv.qr>
Date:	Wed, 9 Jan 2013 10:51:40 +0100 (CET)
From:	Jan Engelhardt <jengelh@...i.de>
To:	"pupilla@...ero.it" <pupilla@...ero.it>
cc:	netdev@...r.kernel.org
Subject: Re: mtu issue with ipsec tunnel and netfilter snat


On Wednesday 2013-01-09 10:01, pupilla@...ero.it wrote:

>As you can see there are incoming 1500 bytes packets (these are the
>decrypted ipsec packets) with DF bit set. These packets are never
>delivered to the final client 10.81.128.176 (the destination address
>is 172.16.128.1 which is the ip used for SNATing the original ip
>10.81.128.176).
>
>IMHO this is a mtu issue: 1500 bytes packets cannot be routed inside
>the ipsec tunnel.
>
>But why linux_gw_snat is not sending icmp need to frag packets to
>10.148.12.23?

Perhaps because ICMP was blocked erroneously?
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