Hi,
can someone help us on below query ?
-Shahid.
On Mon, Apr 1, 2019 at 11:45 AM Shahid Khan via Lists.Fd.Io
<shahidnasimkhan=gmail....@lists.fd.io> wrote:
>
> I have following query related to SNAT on VPP Release 19.0.1.02
>
> following is the code from vpp/src/plugins/nat/in2out.c
>
> static inline int
> snat_not_translate (snat_main_t * sm, vlib_node_runtime_t * node,
> u32 sw_if_index0, ip4_header_t * ip0, u32 proto0,
> u32 rx_fib_index0, u32 thread_index)
> {
> udp_header_t *udp0 = ip4_next_header (ip0);
> snat_session_key_t key0, sm0;
> clib_bihash_kv_8_8_t kv0, value0;
>
> key0.addr = ip0->dst_address;
> key0.port = udp0->dst_port;
> key0.protocol = proto0;
> key0.fib_index = sm->outside_fib_index;
> kv0.key = key0.as_u64;
>
> /* NAT packet aimed at external address if */
> /* has active sessions */
> if (clib_bihash_search_8_8 (&sm->per_thread_data[thread_index].out2in,
> &kv0,
> &value0))
> {
> /* or is static mappings */
> if (!snat_static_mapping_match (sm, key0, &sm0, 1, 0, 0, 0, 0, 0))
> return 0;
> }
> else
> return 0;
>
> if (sm->forwarding_enabled)
> return 1;
>
>
> return snat_not_translate_fast (sm, node, sw_if_index0, ip0, proto0,
> rx_fib_index0);
> }
>
> want to understand why above highlighted condition is there in code ?
>
> this is causing SNAT to stop working the moment we enable forwarding.
> what will be impact we comment this condition ?
>
> -Shahid.
>
>
>
>
>
>
>
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