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bug in ARP FSM with fragmented packets?
- From: Jürgen Lambrecht <J dot Lambrecht at televic dot com>
- To: eCos Discussion <ecos-discuss at ecos dot sourceware dot org>
- Date: Mon, 21 Jan 2008 12:18:16 +0100
- Subject: [ECOS] bug in ARP FSM with fragmented packets?
Hello,
I'm investigating a problem where UDP packets get lost when there is an
ARP table timeout.
- It only happens with UDP, not with TCP; IPv4.
- It only happens with fragmented IP packets, so with UDP packets bigger
than the Ethernet MTU of 1518 Bytes.
- I use freeBSD stack, version from CVS end 2007
This is what I see with Ethereal: The application receives a UDP request
packet, and must send back a UDP reply packet. Instead an ARP
request/reply happens, and the packet gets lost.
Using static ARP table entries solves the problem of course, but that is
not acceptable.
Has anybody seen such a problem before?
Or has anybody a clue where to start looking?
I will do new and more detailed tests next week, and start looking to
the bsd_tcpip code.
Kind regards,
--
Jürgen Lambrecht
R&D Engineer
Televic Transport Systems
http://www.televic.com
Televic NV / SA (main office)
Leo Bekaertlaan 1
B-8870 Izegem
Tel: +32 (0)51 303045
Fax: +32 (0)51 310670
--
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