Hi, I found a bug and fixed it, so I don't know if I need to use bugzilla for that? In attach the patch. file: net/common/current/src/dhcp_prot.c According to RFC 2131 (http://www.faqs.org/rfcs/rfc2131.html): "The DHCPREQUEST message contains the same 'xid' as the DHCPOFFER message." So in a DHCP DORA cycle (Discover-Offer-Request-Acknowledge) the same transaction ID should be used ('xid' in C code). We never had problems with that, but now we have a strict customer.. Kind regards, Jürgen -- Jürgen Lambrecht R&D Associate Mobile: +32 499 644 531 Tel: +32 (0)51 303045 Fax: +32 (0)51 310670 http://www.televic-rail.com Televic Rail NV - Leo Bekaertlaan 1 - 8870 Izegem - Belgium Company number 0825.539.581 - RPR Kortrijk