* ip rule cannot match based on the source IPv4 address
@ 2023-03-26 7:06 智慧雨泽
0 siblings, 0 replies; only message in thread
From: 智慧雨泽 @ 2023-03-26 7:06 UTC (permalink / raw)
To: lartc
[-- Attachment #1.1: Type: text/plain, Size: 20090 bytes --]
Hi there,
I recently had trouble deploying my Linux based BGP router, ip rule cannot selecting route table based on source ipv4 address
Our network structure is like this.
GRE
Server(IN) >>>>> Server(SG)>>> upstream.
SG(root@yxvm-2252644:~#) just means the Singapore node from another provider that supports BGP.
IN(root@ip007-20230227) refers to my vultr dedicated server in India, I did not configure BGP with vultr here, because vultr refused to accept my prefix.
The following is the routing information to 8.8.8.8 obtained on my SG server
root@ip007-20230227:~# ip route 46.23.100.0 8.8.8.8
Command "46.23.100.0" is unknown, try "ip route help".
root@ip007-20230227:~# ip route from 46.23.100.0 8.8.8.8
Command "from" is unknown, try "ip route help".
root@ip007-20230227:~# ip route get 8.8.8.8
8.8.8.8 via 139.84.140.1 dev enp1s0f0 src 139.84.140.60 uid 0
cache
root@ip007-20230227:~# ip route get 8.8.8.8 table 147
Error: inet prefix is expected rather than "table".
root@ip007-20230227:~# ip route show table 147 | grep 8.8.8
8.8.8.0/24 via 10.0.5.1 dev gre_sg proto bird metric 32
98.8.8.0/23 via 10.0.5.1 dev gre_sg proto bird metric 32
198.8.80.0/24 via 10.0.5.1 dev gre_sg proto bird metric 32
198.8.81.0/24 via 10.0.5.1 dev gre_sg proto bird metric 32
198.8.82.0/24 via 10.0.5.1 dev gre_sg proto bird metric 32
198.8.83.0/24 via 10.0.5.1 dev gre_sg proto bird metric 32
198.8.84.0/24 via 10.0.5.1 dev gre_sg proto bird metric 32
198.8.85.0/24 via 10.0.5.1 dev gre_sg proto bird metric 32
198.8.86.0/24 via 10.0.5.1 dev gre_sg proto bird metric 32
198.8.87.0/24 via 10.0.5.1 dev gre_sg proto bird metric 32
198.8.88.0/24 via 10.0.5.1 dev gre_sg proto bird metric 32
198.8.89.0/24 via 10.0.5.1 dev gre_sg proto bird metric 32
root@ip007-20230227:~#
When I use ping, I did not got any output from tcpdump for interface gre_sg.
I think it would be better to paste the full output so we can communicate, let's call it TEST 1.
--------------------------------------------- TEST 1 ---------------------------------------------
root@ip007-20230227:~# ping -I dummy2 8.8.8.8
PING 8.8.8.8 (8.8.8.8) from 46.23.100.0 dummy2: 56(84) bytes of data.
root@ip007-20230227:~# tcpdump -i gre_sg host 8.8.8.8 -v -v
tcpdump: listening on gre_sg, link-type LINUX_SLL (Linux cooked v1), snapshot length 262144 bytes
root@ip007-20230227:~# tcpdump -i gre_sg host 8.8.8.8
tcpdump: verbose output suppressed, use -v[v]... for full protocol decode
listening on gre_sg, link-type LINUX_SLL (Linux cooked v1), snapshot length 262144 bytes
^C
0 packets captured
0 packets received by filter
0 packets dropped by kernel
root@ip007-20230227:~# tcpdump -i gre_sg host 8.8.8.8 -v
tcpdump: listening on gre_sg, link-type LINUX_SLL (Linux cooked v1), snapshot length 262144 bytes
^C
0 packets captured
0 packets received by filter
0 packets dropped by kernel
root@ip007-20230227:~# tcpdump -i gre_sg host 8.8.8.8 -v -v
tcpdump: listening on gre_sg, link-type LINUX_SLL (Linux cooked v1), snapshot length 262144 bytes
^C
0 packets captured
0 packets received by filter
0 packets dropped by kernel
root@ip007-20230227:~# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: enp1s0f0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
link/ether 3c:ec:ef:ba:6c:80 brd ff:ff:ff:ff:ff:ff
inet 139.84.140.60/23 brd 139.84.141.255 scope global dynamic enp1s0f0
valid_lft 75843sec preferred_lft 75843sec
inet6 2401:c080:3000:2a5c:3eec:efff:feba:6c80/64 scope global dynamic mngtmpaddr
valid_lft 2591985sec preferred_lft 604785sec
inet6 fe80::3eec:efff:feba:6c80/64 scope link
valid_lft forever preferred_lft forever
3: enp1s0f1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
link/ether 3c:ec:ef:ba:6c:81 brd ff:ff:ff:ff:ff:ff
6: dummy2: <BROADCAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN group default qlen 1000
link/ether 2e:45:0b:65:83:40 brd ff:ff:ff:ff:ff:ff
inet 46.23.100.0/32 scope global dummy2
valid_lft forever preferred_lft forever
inet6 fe80::2c45:bff:fe65:8340/64 scope link
valid_lft forever preferred_lft forever
7: sit0@NONE: <NOARP> mtu 1480 qdisc noop state DOWN group default qlen 1000
link/sit 0.0.0.0 brd 0.0.0.0
10: gre0@NONE: <NOARP> mtu 1476 qdisc noop state DOWN group default qlen 1000
link/gre 0.0.0.0 brd 0.0.0.0
11: gretap0@NONE: <BROADCAST,MULTICAST> mtu 1462 qdisc noop state DOWN group default qlen 1000
link/ether 00:00:00:00:00:00 brd ff:ff:ff:ff:ff:ff
12: erspan0@NONE: <BROADCAST,MULTICAST> mtu 1450 qdisc noop state DOWN group default qlen 1000
link/ether 00:00:00:00:00:00 brd ff:ff:ff:ff:ff:ff
14: sit2@NONE: <POINTOPOINT,NOARP,UP,LOWER_UP> mtu 1480 qdisc noqueue state UNKNOWN group default qlen 1000
link/sit 139.84.140.60 peer 178.173.233.141
inet 10.0.2.2/24 brd 10.0.2.255 scope global sit2
valid_lft forever preferred_lft forever
inet6 2407:d340:7500:2::2/64 scope global
valid_lft forever preferred_lft forever
inet6 fe80::8b54:8c3c/64 scope link
valid_lft forever preferred_lft forever
15: gre_sg@enp1s0f0: <POINTOPOINT,NOARP,UP,LOWER_UP> mtu 1476 qdisc noqueue state UNKNOWN group default qlen 1000
link/gre 139.84.140.60 peer 178.173.233.141
inet 10.0.5.2/24 brd 10.0.5.255 scope global gre_sg
valid_lft forever preferred_lft forever
inet6 fe80::200:5efe:8b54:8c3c/64 scope link
valid_lft forever preferred_lft forever
16: twix: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq state UNKNOWN group default qlen 1000
link/ether 76:a0:c4:30:96:38 brd ff:ff:ff:ff:ff:ff
inet 10.0.4.2/24 scope global twix
valid_lft forever preferred_lft forever
inet6 fe80::c44f:2eff:fe15:8d02/64 scope link
valid_lft forever preferred_lft forever
root@ip007-20230227:~# tcpdump -i enp1s0f0 host 8.8.8.8 -v -v
tcpdump: listening on enp1s0f0, link-type EN10MB (Ethernet), snapshot length 262144 bytes
^C
0 packets captured
0 packets received by filter
0 packets dropped by kernel
root@ip007-20230227:~# tcpdump -i any host 8.8.8.8 -v -v
tcpdump: data link type LINUX_SLL2
tcpdump: listening on any, link-type LINUX_SLL2 (Linux cooked v2), snapshot length 262144 bytes
11:57:26.104394 dummy2 Out IP (tos 0x0, ttl 64, id 34501, offset 0, flags [DF], proto ICMP (1), length 84)
46.23.100.0 > dns.google: ICMP echo request, id 9579, seq 221, length 64
11:57:27.128409 dummy2 Out IP (tos 0x0, ttl 64, id 34623, offset 0, flags [DF], proto ICMP (1), length 84)
46.23.100.0 > dns.google: ICMP echo request, id 9579, seq 222, length 64
11:57:28.152409 dummy2 Out IP (tos 0x0, ttl 64, id 34771, offset 0, flags [DF], proto ICMP (1), length 84)
46.23.100.0 > dns.google: ICMP echo request, id 9579, seq 223, length 64
11:57:29.176411 dummy2 Out IP (tos 0x0, ttl 64, id 34918, offset 0, flags [DF], proto ICMP (1), length 84)
46.23.100.0 > dns.google: ICMP echo request, id 9579, seq 224, length 64
11:57:30.200413 dummy2 Out IP (tos 0x0, ttl 64, id 35005, offset 0, flags [DF], proto ICMP (1), length 84)
46.23.100.0 > dns.google: ICMP echo request, id 9579, seq 225, length 64
11:57:31.224391 dummy2 Out IP (tos 0x0, ttl 64, id 35173, offset 0, flags [DF], proto ICMP (1), length 84)
46.23.100.0 > dns.google: ICMP echo request, id 9579, seq 226, length 64
11:57:32.248404 dummy2 Out IP (tos 0x0, ttl 64, id 35175, offset 0, flags [DF], proto ICMP (1), length 84)
46.23.100.0 > dns.google: ICMP echo request, id 9579, seq 227, length 64
^C
7 packets captured
8 packets received by filter
0 packets dropped by kernel
root@ip007-20230227:~# tcpdump -i any host 8.8.8.8 -v
tcpdump: data link type LINUX_SLL2
tcpdump: listening on any, link-type LINUX_SLL2 (Linux cooked v2), snapshot length 262144 bytes
11:57:37.368392 dummy2 Out IP (tos 0x0, ttl 64, id 36107, offset 0, flags [DF], proto ICMP (1), length 84)
46.23.100.0 > dns.google: ICMP echo request, id 9579, seq 232, length 64
11:57:38.392401 dummy2 Out IP (tos 0x0, ttl 64, id 36316, offset 0, flags [DF], proto ICMP (1), length 84)
46.23.100.0 > dns.google: ICMP echo request, id 9579, seq 233, length 64
11:57:39.416433 dummy2 Out IP (tos 0x0, ttl 64, id 36335, offset 0, flags [DF], proto ICMP (1), length 84)
46.23.100.0 > dns.google: ICMP echo request, id 9579, seq 234, length 64
11:57:40.440394 dummy2 Out IP (tos 0x0, ttl 64, id 36550, offset 0, flags [DF], proto ICMP (1), length 84)
46.23.100.0 > dns.google: ICMP echo request, id 9579, seq 235, length 64
11:57:41.464401 dummy2 Out IP (tos 0x0, ttl 64, id 36651, offset 0, flags [DF], proto ICMP (1), length 84)
46.23.100.0 > dns.google: ICMP echo request, id 9579, seq 236, length 64
11:57:42.488411 dummy2 Out IP (tos 0x0, ttl 64, id 36825, offset 0, flags [DF], proto ICMP (1), length 84)
46.23.100.0 > dns.google: ICMP echo request, id 9579, seq 237, length 64
^C
6 packets captured
7 packets received by filter
0 packets dropped by kernel
---------------------------------------------------------------------END OF TEST 1-----------------------------------------------------
For the second test, I switched to MTR. Let's call it TEST 2
------------------------------------------------------------------------------------------TEST 2------------------------------
root@ip007-20230227:~# mtr -a 46.23.100.0 8.8.8.8
root@ip007-20230227:~# tcpdump -i any host 8.8.8.8 -v
tcpdump: data link type LINUX_SLL2
tcpdump: listening on any, link-type LINUX_SLL2 (Linux cooked v2), snapshot length 262144 bytes
12:02:37.138196 enp1s0f0 Out IP (tos 0x0, ttl 1, id 6453, offset 0, flags [none], proto ICMP (1), length 64)
46.23.100.0 > dns.google: ICMP echo request, id 54563, seq 33000, length 44
12:02:37.238495 enp1s0f0 Out IP (tos 0x0, ttl 2, id 6475, offset 0, flags [none], proto ICMP (1), length 64)
46.23.100.0 > dns.google: ICMP echo request, id 54563, seq 33001, length 44
12:02:37.338799 enp1s0f0 Out IP (tos 0x0, ttl 3, id 6498, offset 0, flags [none], proto ICMP (1), length 64)
46.23.100.0 > dns.google: ICMP echo request, id 54563, seq 33002, length 44
12:02:37.439118 enp1s0f0 Out IP (tos 0x0, ttl 4, id 6510, offset 0, flags [none], proto ICMP (1), length 64)
46.23.100.0 > dns.google: ICMP echo request, id 54563, seq 33003, length 44
12:02:37.539427 enp1s0f0 Out IP (tos 0x0, ttl 5, id 6528, offset 0, flags [none], proto ICMP (1), length 64)
46.23.100.0 > dns.google: ICMP echo request, id 54563, seq 33004, length 44
12:02:37.639748 enp1s0f0 Out IP (tos 0x0, ttl 6, id 6536, offset 0, flags [none], proto ICMP (1), length 64)
46.23.100.0 > dns.google: ICMP echo request, id 54563, seq 33005, length 44
12:02:37.740067 enp1s0f0 Out IP (tos 0x0, ttl 7, id 6561, offset 0, flags [none], proto ICMP (1), length 64)
46.23.100.0 > dns.google: ICMP echo request, id 54563, seq 33006, length 44
root@ip007-20230227:~# tcpdump -i gre_sg host 8.8.8.8 -v -v
tcpdump: listening on gre_sg, link-type LINUX_SLL (Linux cooked v1), snapshot length 262144 bytes
^C
0 packets captured
0 packets received by filter
root@ip007-20230227:~# tcpdump -i enp1s0f0 host 8.8.8.8 -v -v
tcpdump: listening on enp1s0f0, link-type EN10MB (Ethernet), snapshot length 262144 bytes
12:03:46.936558 IP (tos 0x0, ttl 6, id 15388, offset 0, flags [none], proto ICMP (1), length 64)
46.23.100.0 > dns.google: ICMP echo request, id 54563, seq 33971, length 44
12:03:47.008335 IP (tos 0x0, ttl 7, id 15405, offset 0, flags [none], proto ICMP (1), length 64)
46.23.100.0 > dns.google: ICMP echo request, id 54563, seq 33972, length 44
12:03:47.079988 IP (tos 0x0, ttl 8, id 15412, offset 0, flags [none], proto ICMP (1), length 64)
46.23.100.0 > dns.google: ICMP echo request, id 54563, seq 33973, length 44
12:03:47.151624 IP (tos 0x0, ttl 9, id 15426, offset 0, flags [none], proto ICMP (1), length 64)
46.23.100.0 > dns.google: ICMP echo request, id 54563, seq 33974, length 44
12:03:47.223336 IP (tos 0x0, ttl 10, id 15439, offset 0, flags [none], proto ICMP (1), length 64)
------------------------------------------------END OF TEST 2-----------------------------------------------------
For netcat, let's call it TEST 3
For the method used by different tcpdumps, I send "hello" every time
---------------------------------------------------------------------------------------TEST 3-------------------------------------------------------------------
root@ip007-20230227:~# nc -s 46.23.100.0 -u 8.8.8.8 53
hello
hello
hello
root@ip007-20230227:~# tcpdump -i enp1s0f0 host 8.8.8.8 -v -v
tcpdump: listening on enp1s0f0, link-type EN10MB (Ethernet), snapshot length 262144 bytes
^C
0 packets captured
0 packets received by filter
0 packets dropped by kernel
root@ip007-20230227:~# tcpdump -i gre_sg host 8.8.8.8 -v -v
tcpdump: listening on gre_sg, link-type LINUX_SLL (Linux cooked v1), snapshot length 262144 bytes
12:09:16.198374 IP (tos 0x0, ttl 64, id 58243, offset 0, flags [DF], proto UDP (17), length 34)
46.23.100.0.24017 > dns.google.domain: [bad udp cksum 0xa246 -> 0xbbc8!] domain [length 6 < 12] (invalid)
^C
1 packet captured
1 packet received by filter
0 packets dropped by kernel
root@ip007-20230227:~# tcpdump -i any host 8.8.8.8 -v
tcpdump: data link type LINUX_SLL2
tcpdump: listening on any, link-type LINUX_SLL2 (Linux cooked v2), snapshot length 262144 bytes
12:09:27.702784 gre_sg Out IP (tos 0x0, ttl 64, id 58244, offset 0, flags [DF], proto UDP (17), length 34)
46.23.100.0.24017 > dns.google.domain: domain [length 6 < 12] (invalid)
Last login: Tue Mar 21 11:37:12 2023 from 140.138.182.239
root@yxvm-2252644:~# tcpdump -i any host 8.8.8.8 -v
tcpdump: data link type LINUX_SLL2
tcpdump: listening on any, link-type LINUX_SLL2 (Linux cooked v2), snapshot length 262144 bytes
12:10:58.237149 vultr_IN In IP (tos 0x0, ttl 64, id 58245, offset 0, flags [DF], proto UDP (17), length 61)
46.23.100.0.24017 > dns.google.domain: 18031 zoneInit [b2&3=0x7220] [29795a] [28261q] [24948n] [11296au] [|domain]
12:10:58.237168 eth0 Out IP (tos 0x0, ttl 63, id 58245, offset 0, flags [DF], proto UDP (17), length 61)
46.23.100.0.24017 > dns.google.domain: 18031 zoneInit [b2&3=0x7220] [29795a] [28261q] [24948n] [11296au] [|domain]
^C
2 packets captured
4 packets received by filter
0 packets dropped by kernel
root@yxvm-2252644:~# tcpdump -i eth0 host 8.8.8.8 -v
tcpdump: listening on eth0, link-type EN10MB (Ethernet), snapshot length 262144 bytes
12:11:22.977896 IP (tos 0x0, ttl 63, id 58246, offset 0, flags [DF], proto UDP (17), length 34)
46.23.100.0.24017 > dns.google.domain: domain [length 6 < 12] (invalid)
^C
1 packet captured
1 packet received by filter
0 packets dropped by kernel
root@yxvm-2252644:~# tcpdump -i vultr_IN host 8.8.8.8 -v
tcpdump: listening on vultr_IN, link-type LINUX_SLL (Linux cooked v1), snapshot length 262144 bytes
12:12:02.239933 IP (tos 0x0, ttl 64, id 58247, offset 0, flags [DF], proto UDP (17), length 29)
46.23.100.0.24017 > dns.google.domain: domain [length 1 < 12] (invalid)
root@yxvm-2252644:~# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,L
OWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
link/ether ba:5e:16:eb:32:7d brd ff:ff:ff:ff:ff:ff
altname enp0s18
altname ens18
inet 178.173.233.141/25 brd 178.173.233.255 scope global eth0
valid_lft forever preferred_lft forever
inet6 2404:92c0:233:2271:b85e:16ff:feeb:327d/64 scope global dynamic mngtmpaddr
valid_lft 2591779sec preferred_lft 604579sec
inet6 fe80::b85e:16ff:feeb:327d/64 scope link
valid_lft forever preferred_lft forever
3: gre0@NONE: <NOARP> mtu 1476 qdisc noop state DOWN group default qlen 1000
link/gre 0.0.0.0 brd 0.0.0.0
4: gretap0@NONE: <BROADCAST,MULTICAST> mtu 1462 qdisc noop state DOWN group default qlen 1000
link/ether 00:00:00:00:00:00 brd ff:ff:ff:ff:ff:ff
5: erspan0@NONE: <BROADCAST,MULTICAST> mtu 1450 qdisc noop state DOWN group default qlen 1000
link/ether 00:00:00:00:00:00 brd ff:ff:ff:ff:ff:ff
6: gretap1@eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1462 qdisc fq state UNKNOWN group default qlen 1000
link/ether c2:42:c3:89:8a:3d brd ff:ff:ff:ff:ff:ff
inet 10.0.0.1/24 brd 10.0.0.255 scope global gretap1
valid_lft forever preferred_lft forever
inet6 2407:d340:7500:1::1/64 scope global
valid_lft forever preferred_lft forever
inet6 fe80::c042:c3ff:fe89:8a3d/64 scope link
valid_lft forever preferred_lft forever
7: dummy3: <BROADCAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN group default qlen 1000
link/ether 2e:7c:bc:6d:7d:f2 brd ff:ff:ff:ff:ff:ff
inet6 2407:d340:7100::1/128 scope global
valid_lft forever preferred_lft forever
inet6 2407:d340:7100::/128 scope global
valid_lft forever preferred_lft forever
inet6 fe80::2c7c:bcff:fe6d:7df2/64 scope link
valid_lft forever preferred_lft forever
8: dummy1: <BROADCAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN group default qlen 1000
link/ether 0a:29:d5:31:67:84 brd ff:ff:ff:ff:ff:ff
inet6 2407:d340:7500::1/128 scope global
valid_lft forever preferred_lft forever
inet6 2407:d340:7500::/128 scope global
valid_lft forever preferred_lft forever
inet6 fe80::829:d5ff:fe31:6784/64 scope link
valid_lft forever preferred_lft forever
9: sit0@NONE: <NOARP> mtu 1480 qdisc noop state DOWN group default qlen 1000
link/sit 0.0.0.0 brd 0.0.0.0
10: sit2@NONE: <POINTOPOINT,NOARP,UP,LOWER_UP> mtu 1480 qdisc noqueue state UNKNOWN group default qlen 1000
link/sit 178.173.233.141 peer 139.84.140.60
inet6 2407:d340:7500:2::1/64 scope global
valid_lft forever preferred_lft forever
inet6 fe80::b2ad:e98d/64 scope link
valid_lft forever preferred_lft forever
11: vultr_IN@eth0: <POINTOPOINT,NOARP,UP,LOWER_UP> mtu 1476 qdisc noqueue state UNKNOWN group default qlen 1000
link/gre 178.173.233.141 peer 139.84.140.60
inet 10.0.5.1/24 brd 10.0.5.255 scope global vultr_IN
valid_lft forever preferred_lft forever
inet6 fe80::200:5efe:b2ad:e98d/64 scope link
valid_lft forever preferred_lft forever
root@yxvm-2252644:~#-
-----------------------------------------------------------END OF TEST 3--------------------------------------------------
This is the full mash BGP routing table. Please check the email attachment.
https://drive.google.com/file/d/1HWuVecElPgHt2VKvFxq88-YFOiP-ecrT/view?usp=drive_web
I think it might have something to do with the software calling network-related modules(netcat follows IP rule but mtr and ping don't), but if some software doesn't obey the ip rule, then it will be a problem (the ip -6 rule doesn't have this problem)
Best,
[-- Attachment #1.2: publickey - Huiyuze_Zhi@protonmail.com - 0x3063182D.asc --]
[-- Type: application/pgp-keys, Size: 3162 bytes --]
[-- Attachment #2: OpenPGP digital signature --]
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2023-03-26 7:06 ip rule cannot match based on the source IPv4 address 智慧雨泽
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