Hello. We've tried to force to work this attribute and we've find out that description in documentation is totally wrong. You should write bytes in hex separeted by space. For example: DHCP-Vendor-Encap-Option = "01 26 68 74 74 70 3A 2F 2F" Client will get option 43 with these bytes. -- Stanislav Zaikin Network Engineer JSC Ufanet