Hi,
Thanks for your reply, and sorry for answering in English - I can't reach my work PC at this moment.
1. Модели, H/W F/W для всех участников:
DGS Dams switchs: DGS-1024D
DES switchs: DES3250TG, H/W version: A1, F/W version: v.4.50-B13, taken from
http://tsd.dlink.com.tw/.
DGS Managed switchs: DGS3225TGR, H/W version: 2A1, F/W version: 2.03.008
2. Лог пакетов сниффером Ethereal на тех учестках сети, где идут потери:
Unfortunately, we didn't save the log. The switches were removed and are ready to be send back to the vendor. If we didn't send them yet, I'll reproduce the setup and attach the log.
More info: we have tested DGS-1016D switchs (with less PCs), before buying the DGS-1024D models, and encounter the same behavior. But I supposed that this is specific switchs hardware problem, and just return them to the vendor.
И вопрос, - а если DGS-1 и 2 поменять местами или залинковать их другими портами - история повторяется?
Yes, we have tested different combinations. It was very critical to us to make it work, and we spent about 3 hours of testing. Currently, we changed the switchs with DGS-3225TGR, which are working fine.
Last comment: we have same setup in our second office, but Netgear damn switchs, and this setup is working fine.