Hi Matus, Yes. When out interface is virtual tunnel interface and has no address, it does not work.
Thanks a lot, Hongjun From: Matus Fabian -X (matfabia - PANTHEON TECHNOLOGIES at Cisco) [mailto:matfa...@cisco.com] Sent: Tuesday, April 25, 2017 1:34 PM To: Ni, Hongjun <hongjun...@intel.com>; vpp-dev@lists.fd.io Cc: nsh_sfc-...@lists.fd.io Subject: RE: [vpp-dev] An issue about SNAT when using different in and out interfaces Hi, It looks like there is some bug when snat interface doesn't have address (if snat interfaces have address it works fine). I will fix issue. Regards, Matus From: vpp-dev-boun...@lists.fd.io<mailto:vpp-dev-boun...@lists.fd.io> [mailto:vpp-dev-boun...@lists.fd.io] On Behalf Of Ni, Hongjun Sent: Tuesday, April 25, 2017 6:05 AM To: vpp-dev@lists.fd.io<mailto:vpp-dev@lists.fd.io> Cc: nsh_sfc-...@lists.fd.io<mailto:nsh_sfc-...@lists.fd.io> Subject: [vpp-dev] An issue about SNAT when using different in and out interfaces Hey, When I applied SNAT in different in and out interfaces, I run into an issue: My configuration: set interface snat in TenGigabitEthernet5/0/0 out TenGigabitEthernet5/0/1 snat add static mapping local 192.168.50.76 external 10.10.23.45 I sent packets from TenGigabitEthernet5/0/0. In previous code about a month ago, the packets are sent to TenGigabitEthernet5/0/1 as expected. But in current 17.04 code, packets are sent to TenGigabitEthernet5/0/0, which is not expected. Could you give some advice on how to fix this issue? Below is the interface and snat detail: DBGvpp# sh int Name Idx State Counter Count TenGigabitEthernet5/0/0 1 up rx packets 1 rx bytes 60 tx packets 1 tx bytes 60 ip4 1 TenGigabitEthernet5/0/1 2 up local0 0 down DBGvpp# DBGvpp# sh snat detail SNAT mode: dynamic translations enabled TenGigabitEthernet5/0/0 in TenGigabitEthernet5/0/1 out 0 users, 0 outside addresses, 0 active sessions, 1 static mappings Hash table in2out 0 active elements 0 free lists 0 linear search buckets Hash table out2in 0 active elements 0 free lists 0 linear search buckets Hash table worker-by-in 0 active elements 0 free lists 0 linear search buckets Hash table worker-by-out 0 active elements 0 free lists 0 linear search buckets static mappings: local 192.168.50.76 external 10.10.23.45 vrf 0 Below is the packet trace: 00:02:16:415613: dpdk-input TenGigabitEthernet5/0/0 rx queue 0 buffer 0xbf9c22: current data 14, length 46, free-list 0, clone-count 0, totlen-nifb 0, trace 0x0 PKT MBUF: port 0, nb_segs 1, pkt_len 60 buf_len 2176, data_len 60, ol_flags 0x180, data_off 128, phys_addr 0x28e6c780 packet_type 0x0 Packet Offload Flags PKT_RX_IP_CKSUM_GOOD (0x0080) IP cksum of RX pkt. is valid PKT_RX_L4_CKSUM_GOOD (0x0100) L4 cksum of RX pkt. is valid IP4: 08:00:27:61:07:05 -> 90:e2:ba:48:7a:80 UDP: 192.168.50.76 -> 10.10.23.46 tos 0x00, ttl 64, length 46, checksum 0x6693 fragment id 0x0000 UDP: 63 -> 63 length 26, checksum 0xa2be 00:02:16:415653: ip4-input-no-checksum UDP: 192.168.50.76 -> 10.10.23.46 tos 0x00, ttl 64, length 46, checksum 0x6693 fragment id 0x0000 UDP: 63 -> 63 length 26, checksum 0xa2be 00:02:16:415668: snat-in2out SNAT_IN2OUT_FAST_PATH: sw_if_index 1, next index 2, session -1 00:02:16:415685: snat-in2out-slowpath SNAT_IN2OUT_SLOW_PATH: sw_if_index 1, next index 0, session -1 00:02:16:415695: ip4-lookup fib 0 dpo-idx 3 flow hash: 0x00000000 UDP: 192.168.50.76 -> 10.10.23.46 tos 0x00, ttl 64, length 46, checksum 0x6693 fragment id 0x0000 UDP: 63 -> 63 length 26, checksum 0xa2be 00:02:16:415703: ip4-rewrite tx_sw_if_index 1 dpo-idx 3 : ipv4 via 10.10.23.46 TenGigabitEthernet5/0/0: 90e2ba48234590e2ba487a800800 flow hash: 0x00000000 00000000: 90e2ba48234590e2ba487a8008004500002e000000003f116793c0a8324c0a0a 00000020: 172e003f003f001aa2be000102030405060708090a0b0c0d0e0f1011 00:02:16:415709: TenGigabitEthernet5/0/0-output TenGigabitEthernet5/0/0 IP4: 90:e2:ba:48:7a:80 -> 90:e2:ba:48:23:45 UDP: 192.168.50.76 -> 10.10.23.46 tos 0x00, ttl 63, length 46, checksum 0x6793 fragment id 0x0000 UDP: 63 -> 63 length 26, checksum 0xa2be 00:02:16:415718: TenGigabitEthernet5/0/0-tx TenGigabitEthernet5/0/0 tx queue 0 buffer 0xbf9c22: current data 0, length 60, free-list 0, clone-count 0, totlen-nifb 0, trace 0x0 IP4: 90:e2:ba:48:7a:80 -> 90:e2:ba:48:23:45 UDP: 192.168.50.76 -> 10.10.23.46 tos 0x00, ttl 63, length 46, checksum 0x6793 fragment id 0x0000 UDP: 63 -> 63 length 26, checksum 0xa2be Thanks, Hongjun
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