Hello Giuseppe,we believe that we hit the bug described in the field notice:Field Notice: FN - 26096-WS-X6148-GE-TX,  WS-X6548-GE-TX-May Drop Valid Packets on Egress-Hardware Modification  Has Been Implementedhttp://www.cisco.com/en/US/ts/fn/200/fn26...

Hi Giuseppe,thx for your answer but this is not correct. If you look closer to the release notes (10/100/1000 Ethernet Switching Modules) you will see that the modul 6148 is supported.http://www.cisco.com/en/US/docs/switches/lan/catalyst6500/ios/12.2...

Hi,we have the same problem here with a Linux Firewall connected via a dot1q Trunk on a c6509. If we connect the Firewall and the PC on the same cu-module(WS-X6148-GE-TX) we have problems to get arp answers from the Firewall. Devices on Fibercards ge...