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(usagi-users 02544) Re: ICMPv6(Packet too big)

Hello,

Thank you for bug report.
I will check it.

I also think it may be bug.

On Fri, 12 Sep 2003 13:37:54 +0900
""村瀬　将"" <murase@xxxxxxxxxxxxxx> wrote:

> Hi.
> 
> I found BUG of ICMPv6(Packet Too Big) in USAGI STABLE RELEASE 4.1.
> I think so.
> 
> 
> It is an TEST of IPsec(tunnel mode) by the following connections.
> (Ref,,Chapter 3.2 Tunnel Mode on USAGI IPsec document(in www.linux-ipv6.org))
> 
> HOST1-eth0------eth0-SG1-eth1===========eth1-SG2-eth0------eth0-HOST2
>                            |<-- tunnel -->|
> 
> MTU of all is 1500Byte.
> 
> The IPv6 Packet of 1500 Byte is sent from HOST1 to HOST2 via SG1.
> 
> This pakect is transformed data in SG1.
> This transform is addition of tunnel header and ESP header.
> 
> HOST1 receive The ICMPv6's error message from SG1.
> This error message is Packet Too Big(type 2).
> and then MTU of the next-hop link is 1460 Byte.
> 
> This 1460Byte is incorrect.
> I think that correct value is 1430Byte.
> Because sum of tunnel header and ESP header is 70Byte over.
> ( new IPv6 Header (40Byte) + ESP header (30 ~ 37 Byte) )
> 
> How about you?
> 
> 
> ----------------------------------
> NTTエレクトロニクス株式会社(NEL)
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> 電話番号が変わりました。2003/05/19
> 
> 
> 
> 
>