SNAT rules on T0: we need to be able to specify destination IP

[guillierf]

for now, the SNAT rule in the param file looks like this:

Sample entry for PKS PKS-Infra network

• t0_router: DefaultT0Router nat_type: snat source_network: 10.1.1.0/24 # PKS Infra network cidr translated_network: 23.23.23.1 # SNAT External Address for PKS networks rule_priority: 8001 # Lower priority

SNAT is dangerous when the destination network is too wide (i.e destination IP = ANY).

for PKS, we usually restrict the destination IP to a specific CIDR (we don't use ANY because it can break internal communications, from T1 to T1).

request is to be able to specify destination IP (or destination_network) in the above NAT section

[sparameswaran]

added destination_network as optional param for snat rule set.