DHCP Relay No-NAT

Is this because of some automatic NAT function performed by the DHCP Relay VS type?i think so. anyway, it is also snated even having dhcp-no-translate snat object. i am running 11.1.0 hf5. by the way, i am not sure why virtual server name is not shown in tcpdump (lis=).

without dhcp-no-translate snat object

[root@B6400-R69-S9:Active] config  tmsh show sys version|head

Sys::Version
Main Package
  Product  BIG-IP
  Version  11.1.0
  Build    2268.0
  Edition  Hotfix HF5
  Date     Mon Aug 20 14:13:45 PDT 2012

root@B6400-R69-S9(Active)(/Common)(tmos) list ltm virtual bar
ltm virtual bar {
    destination 0.0.0.0:67
    dhcp-relay
    ip-protocol udp
    mask any
    pool foo
    profiles {
        udp { }
    }
    translate-address disabled
    vlans {
        external
    }
    vlans-enabled
}
root@B6400-R69-S9(Active)(/Common)(tmos) list ltm pool foo
ltm pool foo {
    members {
        200.200.200.101:67 {
            address 200.200.200.101
        }
    }
}
root@B6400-R69-S9(Active)(/Common)(tmos) list ltm snat
root@B6400-R69-S9(Active)(/Common)(tmos)

[root@B6400-R69-S9:Active] config  tcpdump -nni 0.0 udp port 67 or icmp -s0
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on 0.0, link-type EN10MB (Ethernet), capture size 65535 bytes
18:40:14.969569 IP 9.9.9.1.67 > 200.200.200.101.67: BOOTP/DHCP, Request from 00:50:56:b3:59:8d, length: 300 in slot1/tmm0 lis=
18:40:14.969630 IP 9.9.9.9.67 > 200.200.200.101.67: BOOTP/DHCP, Request from 00:50:56:b3:59:8d, length: 300 out slot1/tmm0 lis=

with dhcp-no-translate snat object

root@B6400-R69-S9(Active)(/Common)(tmos) list ltm virtual bar
ltm virtual bar {
    destination 0.0.0.0:67
    dhcp-relay
    ip-protocol udp
    mask any
    pool foo
    profiles {
        udp { }
    }
    translate-address disabled
    vlans {
        external
    }
    vlans-enabled
}
root@B6400-R69-S9(Active)(/Common)(tmos) list ltm pool foo
ltm pool foo {
    members {
        200.200.200.101:67 {
            address 200.200.200.101
        }
    }
}
root@B6400-R69-S9(Active)(/Common)(tmos) list ltm snat
ltm snat dhcp-no-translate {
    origins {
        9.9.9.1/32 { }
    }
    translation /Common/9.9.9.1
}

[root@B6400-R69-S9:Active] config  tcpdump -nni 0.0 udp port 67 or icmp -s0
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on 0.0, link-type EN10MB (Ethernet), capture size 65535 bytes
18:49:15.304996 IP 9.9.9.1.67 > 200.200.200.101.67: BOOTP/DHCP, Request from 00:50:56:b3:59:8d, length: 300 in slot1/tmm0 lis=
18:49:15.305056 IP 9.9.9.9.67 > 200.200.200.101.67: BOOTP/DHCP, Request from 00:50:56:b3:59:8d, length: 300 out slot1/tmm0 lis=