From: Benoit Ganne (bganne) <bga...@cisco.com>
Date: Thursday, 1 July 2021 at 11:35
To: Neale Ranns <ne...@graphiant.com>, Mechthild Buescher
<mechthild.buesc...@ericsson.com>, vpp-dev@lists.fd.io <vpp-dev@lists.fd.io>
Subject: RE: [vpp-dev] next-hop-table between two FIB tables results in punt
and 'unknown ip protocol'
>> As 198.19.255.249 is the IP of host-Vpp2Host.4093, VPP interprets it as
>> you want to deliver the packet locally instead of forwarding it. Try
>> changing it to:
>> ip route add 198.19.255.248/29 table 1 via 0.0.0.0 next-hop-table 4093
> 0.0.0.0/32 in any table is a drop. One cannot specify a route to be
> recursive via another network, i.e. via 0.0.0.0/0, VPP doesn't support
> that.
I do not disagree with the rest of your comment, however this worked for me
though - maybe because of some odd cli behavior?
probably ๐
vpp# create packet-generator interface pg0
vpp# create packet-generator interface pg1
vpp# set int ip addr pg0 192.168.1.1/24
vpp# set int st pg0 up
vpp# ip table add 4093
vpp# set int st pg1 up
vpp# set int ip table pg1 4093
vpp# set int ip address pg1 198.19.255.249/29
vpp# ip neigh pg1 198.19.255.253 1.2.3 static
vpp# ip route add 198.19.255.248/29 via 0.0.0.0 next-hop-table 4093
vpp# sh ip fib 198.19.255.253 table 0
ipv4-VRF:0, fib_index:0, flow hash:[src dst sport dport proto flowlabel ]
epoch:0 flags:none locks:[default-route:1, ]
198.19.255.248/29 fib:0 index:21 locks:2
CLI refs:1 src-flags:added,contributing,active,
path-list:[29] locks:2 flags:shared, uPRF-list:27 len:0 itfs:[]
path:[33] pl-index:29 ip4 weight=1 pref=0 deag: oper-flags:resolved,
fib-index:1
forwarding: unicast-ip4-chain
[@0]: dpo-load-balance: [proto:ip4 index:23 buckets:1 uRPF:27 to:[1:100]]
[0] [@12]: dst-address,unicast lookup in ipv4-VRF:4093
this is a lookup-DPO.
Looks like the CLI interprets โvia 0.0.0.0 next-hop-table 4093โ and โvia
ip4-look-in-table 4093โ as the same thing.
/neale
And tracing seems to give the expected result:
00:00:02:247022: pg-input
stream x, 100 bytes, sw_if_index 1
current data 0, length 100, buffer-pool 0, ref-count 1, trace handle 0x0
UDP: 192.168.1.2 -> 198.19.255.253
tos 0x00, ttl 64, length 100, checksum 0xf2cd dscp CS0 ecn NON_ECN
fragment id 0x0000
UDP: 4321 -> 1234
length 72, checksum 0x7deb
00:00:02:247055: ip4-input
UDP: 192.168.1.2 -> 198.19.255.253
tos 0x00, ttl 64, length 100, checksum 0xf2cd dscp CS0 ecn NON_ECN
fragment id 0x0000
UDP: 4321 -> 1234
length 72, checksum 0x7deb
00:00:02:247079: ip4-lookup
fib 0 dpo-idx 0 flow hash: 0x00000000
UDP: 192.168.1.2 -> 198.19.255.253
tos 0x00, ttl 64, length 100, checksum 0xf2cd dscp CS0 ecn NON_ECN
fragment id 0x0000
UDP: 4321 -> 1234
length 72, checksum 0x7deb
00:00:02:247088: lookup-ip4-dst
fib-index:1 addr:198.19.255.253 load-balance:22
00:00:02:247092: ip4-rewrite
tx_sw_if_index 2 dpo-idx 4 : ipv4 via 198.19.255.253 pg1: mtu:9000 next:3
flags:[] 00010002000302fe257345030800 flow hash: 0x00000000
00000000: 00010002000302fe25734503080045000064000000003f11f3cdc0a80102c613
00000020: fffd10e104d200487deb000102030405060708090a0b0c0d0e0f1011
00:00:02:247099: pg1-output
pg1
IP4: 02:fe:25:73:45:03 -> 00:01:00:02:00:03
UDP: 192.168.1.2 -> 198.19.255.253
tos 0x00, ttl 63, length 100, checksum 0xf3cd dscp CS0 ecn NON_ECN
fragment id 0x0000
UDP: 4321 -> 1234
length 72, checksum 0x7deb
00:00:02:247106: pg1-tx
buffer 0x9ffd4: current data -14, length 114, buffer-pool 0, ref-count 1,
trace handle 0x0
loop-counter 1
IP4: 02:fe:25:73:45:03 -> 00:01:00:02:00:03
UDP: 192.168.1.2 -> 198.19.255.253
tos 0x00, ttl 63, length 100, checksum 0xf3cd dscp CS0 ecn NON_ECN
fragment id 0x0000
UDP: 4321 -> 1234
length 72, checksum 0x7deb
ben
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