neutron

How iptables works when ping instance from controller in all-in-one environment

Asked by Zhen

I setup an Havana OpenStack with openvswitch plugin in all-in-one environment, and successfully created the vlan network and the instances, and from controller node I can ping through all the instances, such as ip "10.0.1.5"
[root@red-controller ~]# nova list
+--------------------------------------+-----------+--------+------------+-------------+--------------------------------+
| ID | Name | Status | Task State | Power State | Networks |
+--------------------------------------+-----------+--------+------------+-------------+--------------------------------+
| b0e6b51a-a88f-4705-aee8-23191365f825 | test-l3-3 | ACTIVE | None | Running | network1=10.0.1.3, 192.168.1.3 |
| 16ad5616-e133-41a1-9d6c-bbaab8f944df | test-l3-4 | ACTIVE | None | Running | network2=10.0.2.3 |
| 906d9c1d-25b1-4cdd-85ea-6ffd47f7bbab | test-l3-5 | ACTIVE | None | Running | network1=10.0.1.4 |
| ee7c6172-f0af-4f44-aabc-0fe4b801a5c3 | test-l3-6 | ACTIVE | None | Running | network1=10.0.1.5 |
+--------------------------------------+-----------+--------+------------+-------------+--------------------------------+

But when I check the iptables, it confused me
[root@red-controller ~]# iptables -S|grep 0d00e75f
-N neutron-openvswi-i0d00e75f-d
-N neutron-openvswi-o0d00e75f-d
-A neutron-openvswi-FORWARD -m physdev --physdev-out tap0d00e75f-d5 --physdev-is-bridged -j neutron-openvswi-sg-chain
-A neutron-openvswi-FORWARD -m physdev --physdev-in tap0d00e75f-d5 --physdev-is-bridged -j neutron-openvswi-sg-chain
-A neutron-openvswi-INPUT -m physdev --physdev-in tap0d00e75f-d5 --physdev-is-bridged -j neutron-openvswi-o0d00e75f-d
-A neutron-openvswi-i0d00e75f-d -m state --state INVALID -j DROP
-A neutron-openvswi-i0d00e75f-d -m state --state RELATED,ESTABLISHED -j RETURN
-A neutron-openvswi-i0d00e75f-d -p tcp -m tcp --dport 80 -j RETURN
-A neutron-openvswi-i0d00e75f-d -s 10.0.1.2/32 -p udp -m udp --sport 67 --dport 68 -j RETURN
-A neutron-openvswi-i0d00e75f-d -j neutron-openvswi-sg-fallback
-A neutron-openvswi-o0d00e75f-d -m mac ! --mac-source FA:16:3E:C7:2C:D8 -j DROP
-A neutron-openvswi-o0d00e75f-d -p udp -m udp --sport 68 --dport 67 -j RETURN
-A neutron-openvswi-o0d00e75f-d ! -s 10.0.1.5/32 -j DROP
-A neutron-openvswi-o0d00e75f-d -p udp -m udp --sport 67 --dport 68 -j DROP
-A neutron-openvswi-o0d00e75f-d -m state --state INVALID -j DROP
-A neutron-openvswi-o0d00e75f-d -m state --state RELATED,ESTABLISHED -j RETURN
-A neutron-openvswi-o0d00e75f-d -j RETURN
-A neutron-openvswi-o0d00e75f-d -j neutron-openvswi-sg-fallback
-A neutron-openvswi-sg-chain -m physdev --physdev-out tap0d00e75f-d5 --physdev-is-bridged -j neutron-openvswi-i0d00e75f-d
-A neutron-openvswi-sg-chain -m physdev --physdev-in tap0d00e75f-d5 --physdev-is-bridged -j neutron-openvswi-o0d00e75f-d

Since the ping package's source is 10.0.1.2 rather than 10.0.1.5, I thought it should be dropped since it match the rule "-A neutron-openvswi-o0d00e75f-d ! -s 10.0.1.5/32 -j DROP". How iptables works when ping instance from controller in all-in-one environment?

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Zhen (mazhenm) said : 		#1

Following is the iptables log when I ping instance.

Sep 9 15:20:39 red-controller kernel: TRACE: raw:OUTPUT:policy:2 IN= OUT=tap9e45dcab-8a SRC=10.0.1.2 DST=10.0.1.5 LEN=84 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=ICMP TYPE=8 CODE=0 ID=3545 SEQ=1 UID=0 GID=0
Sep 9 15:20:39 red-controller kernel: TRACE: mangle:OUTPUT:policy:1 IN= OUT=tap9e45dcab-8a SRC=10.0.1.2 DST=10.0.1.5 LEN=84 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=ICMP TYPE=8 CODE=0 ID=3545 SEQ=1 UID=0 GID=0
Sep 9 15:20:39 red-controller kernel: TRACE: nat:OUTPUT:rule:1 IN= OUT=tap9e45dcab-8a SRC=10.0.1.2 DST=10.0.1.5 LEN=84 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=ICMP TYPE=8 CODE=0 ID=3545 SEQ=1 UID=0 GID=0
Sep 9 15:20:39 red-controller kernel: TRACE: nat:neutron-openvswi-OUTPUT:return:1 IN= OUT=tap9e45dcab-8a SRC=10.0.1.2 DST=10.0.1.5 LEN=84 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=ICMP TYPE=8 CODE=0 ID=3545 SEQ=1 UID=0 GID=0
Sep 9 15:20:39 red-controller kernel: TRACE: nat:OUTPUT:rule:2 IN= OUT=tap9e45dcab-8a SRC=10.0.1.2 DST=10.0.1.5 LEN=84 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=ICMP TYPE=8 CODE=0 ID=3545 SEQ=1 UID=0 GID=0
Sep 9 15:20:39 red-controller kernel: TRACE: nat:neutron-l3-agent-OUTPUT:return:2 IN= OUT=tap9e45dcab-8a SRC=10.0.1.2 DST=10.0.1.5 LEN=84 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=ICMP TYPE=8 CODE=0 ID=3545 SEQ=1 UID=0 GID=0
Sep 9 15:20:39 red-controller kernel: TRACE: nat:OUTPUT:rule:3 IN= OUT=tap9e45dcab-8a SRC=10.0.1.2 DST=10.0.1.5 LEN=84 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=ICMP TYPE=8 CODE=0 ID=3545 SEQ=1 UID=0 GID=0
Sep 9 15:20:39 red-controller kernel: TRACE: nat:nova-api-OUTPUT:return:1 IN= OUT=tap9e45dcab-8a SRC=10.0.1.2 DST=10.0.1.5 LEN=84 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=ICMP TYPE=8 CODE=0 ID=3545 SEQ=1 UID=0 GID=0
Sep 9 15:20:39 red-controller kernel: TRACE: nat:OUTPUT:policy:4 IN= OUT=tap9e45dcab-8a SRC=10.0.1.2 DST=10.0.1.5 LEN=84 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=ICMP TYPE=8 CODE=0 ID=3545 SEQ=1 UID=0 GID=0
Sep 9 15:20:39 red-controller kernel: TRACE: filter:OUTPUT:rule:1 IN= OUT=tap9e45dcab-8a SRC=10.0.1.2 DST=10.0.1.5 LEN=84 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=ICMP TYPE=8 CODE=0 ID=3545 SEQ=1 UID=0 GID=0
Sep 9 15:20:39 red-controller kernel: TRACE: filter:neutron-filter-top:rule:1 IN= OUT=tap9e45dcab-8a SRC=10.0.1.2 DST=10.0.1.5 LEN=84 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=ICMP TYPE=8 CODE=0 ID=3545 SEQ=1 UID=0 GID=0
Sep 9 15:20:39 red-controller kernel: TRACE: filter:neutron-openvswi-local:return:1 IN= OUT=tap9e45dcab-8a SRC=10.0.1.2 DST=10.0.1.5 LEN=84 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=ICMP TYPE=8 CODE=0 ID=3545 SEQ=1 UID=0 GID=0
Sep 9 15:20:39 red-controller kernel: TRACE: filter:neutron-filter-top:rule:2 IN= OUT=tap9e45dcab-8a SRC=10.0.1.2 DST=10.0.1.5 LEN=84 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=ICMP TYPE=8 CODE=0 ID=3545 SEQ=1 UID=0 GID=0
Sep 9 15:20:39 red-controller kernel: TRACE: filter:neutron-l3-agent-local:return:1 IN= OUT=tap9e45dcab-8a SRC=10.0.1.2 DST=10.0.1.5 LEN=84 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=ICMP TYPE=8 CODE=0 ID=3545 SEQ=1 UID=0 GID=0
Sep 9 15:20:39 red-controller kernel: TRACE: filter:neutron-filter-top:return:3 IN= OUT=tap9e45dcab-8a SRC=10.0.1.2 DST=10.0.1.5 LEN=84 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=ICMP TYPE=8 CODE=0 ID=3545 SEQ=1 UID=0 GID=0
Sep 9 15:20:39 red-controller kernel: TRACE: filter:OUTPUT:rule:2 IN= OUT=tap9e45dcab-8a SRC=10.0.1.2 DST=10.0.1.5 LEN=84 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=ICMP TYPE=8 CODE=0 ID=3545 SEQ=1 UID=0 GID=0
Sep 9 15:20:39 red-controller kernel: TRACE: filter:neutron-openvswi-OUTPUT:return:1 IN= OUT=tap9e45dcab-8a SRC=10.0.1.2 DST=10.0.1.5 LEN=84 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=ICMP TYPE=8 CODE=0 ID=3545 SEQ=1 UID=0 GID=0
Sep 9 15:20:39 red-controller kernel: TRACE: filter:OUTPUT:rule:3 IN= OUT=tap9e45dcab-8a SRC=10.0.1.2 DST=10.0.1.5 LEN=84 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=ICMP TYPE=8 CODE=0 ID=3545 SEQ=1 UID=0 GID=0
Sep 9 15:20:39 red-controller kernel: TRACE: filter:neutron-l3-agent-OUTPUT:return:1 IN= OUT=tap9e45dcab-8a SRC=10.0.1.2 DST=10.0.1.5 LEN=84 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=ICMP TYPE=8 CODE=0 ID=3545 SEQ=1 UID=0 GID=0
Sep 9 15:20:39 red-controller kernel: TRACE: filter:OUTPUT:rule:4 IN= OUT=tap9e45dcab-8a SRC=10.0.1.2 DST=10.0.1.5 LEN=84 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=ICMP TYPE=8 CODE=0 ID=3545 SEQ=1 UID=0 GID=0
Sep 9 15:20:39 red-controller kernel: TRACE: filter:nova-filter-top:rule:1 IN= OUT=tap9e45dcab-8a SRC=10.0.1.2 DST=10.0.1.5 LEN=84 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=ICMP TYPE=8 CODE=0 ID=3545 SEQ=1 UID=0 GID=0
Sep 9 15:20:39 red-controller kernel: TRACE: filter:nova-api-local:return:1 IN= OUT=tap9e45dcab-8a SRC=10.0.1.2 DST=10.0.1.5 LEN=84 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=ICMP TYPE=8 CODE=0 ID=3545 SEQ=1 UID=0 GID=0
Sep 9 15:20:39 red-controller kernel: TRACE: filter:nova-filter-top:return:2 IN= OUT=tap9e45dcab-8a SRC=10.0.1.2 DST=10.0.1.5 LEN=84 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=ICMP TYPE=8 CODE=0 ID=3545 SEQ=1 UID=0 GID=0
Sep 9 15:20:39 red-controller kernel: TRACE: filter:OUTPUT:rule:5 IN= OUT=tap9e45dcab-8a SRC=10.0.1.2 DST=10.0.1.5 LEN=84 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=ICMP TYPE=8 CODE=0 ID=3545 SEQ=1 UID=0 GID=0
Sep 9 15:20:39 red-controller kernel: TRACE: filter:nova-api-OUTPUT:return:1 IN= OUT=tap9e45dcab-8a SRC=10.0.1.2 DST=10.0.1.5 LEN=84 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=ICMP TYPE=8 CODE=0 ID=3545 SEQ=1 UID=0 GID=0
Sep 9 15:20:39 red-controller kernel: TRACE: filter:OUTPUT:policy:6 IN= OUT=tap9e45dcab-8a SRC=10.0.1.2 DST=10.0.1.5 LEN=84 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=ICMP TYPE=8 CODE=0 ID=3545 SEQ=1 UID=0 GID=0
Sep 9 15:20:39 red-controller kernel: TRACE: mangle:POSTROUTING:rule:1 IN= OUT=tap9e45dcab-8a SRC=10.0.1.2 DST=10.0.1.5 LEN=84 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=ICMP TYPE=8 CODE=0 ID=3545 SEQ=1 UID=0 GID=0
Sep 9 15:20:39 red-controller kernel: TRACE: mangle:nova-api-POSTROUTING:return:1 IN= OUT=tap9e45dcab-8a SRC=10.0.1.2 DST=10.0.1.5 LEN=84 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=ICMP TYPE=8 CODE=0 ID=3545 SEQ=1 UID=0 GID=0
Sep 9 15:20:39 red-controller kernel: TRACE: mangle:POSTROUTING:policy:3 IN= OUT=tap9e45dcab-8a SRC=10.0.1.2 DST=10.0.1.5 LEN=84 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=ICMP TYPE=8 CODE=0 ID=3545 SEQ=1 UID=0 GID=0
Sep 9 15:20:39 red-controller kernel: TRACE: nat:POSTROUTING:rule:1 IN= OUT=tap9e45dcab-8a SRC=10.0.1.2 DST=10.0.1.5 LEN=84 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=ICMP TYPE=8 CODE=0 ID=3545 SEQ=1 UID=0 GID=0
Sep 9 15:20:39 red-controller kernel: TRACE: nat:neutron-openvswi-POSTROUTING:return:1 IN= OUT=tap9e45dcab-8a SRC=10.0.1.2 DST=10.0.1.5 LEN=84 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=ICMP TYPE=8 CODE=0 ID=3545 SEQ=1 UID=0 GID=0
Sep 9 15:20:39 red-controller kernel: TRACE: nat:POSTROUTING:rule:2 IN= OUT=tap9e45dcab-8a SRC=10.0.1.2 DST=10.0.1.5 LEN=84 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=ICMP TYPE=8 CODE=0 ID=3545 SEQ=1 UID=0 GID=0
Sep 9 15:20:39 red-controller kernel: TRACE: nat:neutron-postrouting-bottom:rule:1 IN= OUT=tap9e45dcab-8a SRC=10.0.1.2 DST=10.0.1.5 LEN=84 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=ICMP TYPE=8 CODE=0 ID=3545 SEQ=1 UID=0 GID=0
Sep 9 15:20:39 red-controller kernel: TRACE: nat:neutron-openvswi-snat:rule:1 IN= OUT=tap9e45dcab-8a SRC=10.0.1.2 DST=10.0.1.5 LEN=84 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=ICMP TYPE=8 CODE=0 ID=3545 SEQ=1 UID=0 GID=0
Sep 9 15:20:39 red-controller kernel: TRACE: nat:neutron-openvswi-float-snat:return:1 IN= OUT=tap9e45dcab-8a SRC=10.0.1.2 DST=10.0.1.5 LEN=84 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=ICMP TYPE=8 CODE=0 ID=3545 SEQ=1 UID=0 GID=0
Sep 9 15:20:39 red-controller kernel: TRACE: nat:neutron-openvswi-snat:return:2 IN= OUT=tap9e45dcab-8a SRC=10.0.1.2 DST=10.0.1.5 LEN=84 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=ICMP TYPE=8 CODE=0 ID=3545 SEQ=1 UID=0 GID=0
Sep 9 15:20:39 red-controller kernel: TRACE: nat:neutron-postrouting-bottom:rule:2 IN= OUT=tap9e45dcab-8a SRC=10.0.1.2 DST=10.0.1.5 LEN=84 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=ICMP TYPE=8 CODE=0 ID=3545 SEQ=1 UID=0 GID=0
Sep 9 15:20:39 red-controller kernel: TRACE: nat:neutron-l3-agent-snat:rule:1 IN= OUT=tap9e45dcab-8a SRC=10.0.1.2 DST=10.0.1.5 LEN=84 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=ICMP TYPE=8 CODE=0 ID=3545 SEQ=1 UID=0 GID=0
Sep 9 15:20:39 red-controller kernel: TRACE: raw:PREROUTING:policy:2 IN=tap9e45dcab-8a OUT= MAC=72:72:93:96:d6:b9:fa:16:3e:c7:2c:d8:08:00 SRC=10.0.1.5 DST=192.168.1.2 LEN=84 TOS=0x00 PREC=0x00 TTL=64 ID=3940 PROTO=ICMP TYPE=0 CODE=0 ID=3545 SEQ=1
Sep 9 15:20:39 red-controller kernel: TRACE: mangle:PREROUTING:policy:1 IN=tap9e45dcab-8a OUT= MAC=72:72:93:96:d6:b9:fa:16:3e:c7:2c:d8:08:00 SRC=10.0.1.5 DST=192.168.1.2 LEN=84 TOS=0x00 PREC=0x00 TTL=64 ID=3940 PROTO=ICMP TYPE=0 CODE=0 ID=3545 SEQ=1
Sep 9 15:20:39 red-controller kernel: TRACE: mangle:INPUT:policy:1 IN=tap9e45dcab-8a OUT= MAC=72:72:93:96:d6:b9:fa:16:3e:c7:2c:d8:08:00 SRC=10.0.1.5 DST=10.0.1.2 LEN=84 TOS=0x00 PREC=0x00 TTL=64 ID=3940 PROTO=ICMP TYPE=0 CODE=0 ID=3545 SEQ=1
Sep 9 15:20:39 red-controller kernel: TRACE: filter:INPUT:rule:1 IN=tap9e45dcab-8a OUT= MAC=72:72:93:96:d6:b9:fa:16:3e:c7:2c:d8:08:00 SRC=10.0.1.5 DST=10.0.1.2 LEN=84 TOS=0x00 PREC=0x00 TTL=64 ID=3940 PROTO=ICMP TYPE=0 CODE=0 ID=3545 SEQ=1
Sep 9 15:20:39 red-controller kernel: TRACE: filter:neutron-openvswi-INPUT:return:6 IN=tap9e45dcab-8a OUT= MAC=72:72:93:96:d6:b9:fa:16:3e:c7:2c:d8:08:00 SRC=10.0.1.5 DST=10.0.1.2 LEN=84 TOS=0x00 PREC=0x00 TTL=64 ID=3940 PROTO=ICMP TYPE=0 CODE=0 ID=3545 SEQ=1
Sep 9 15:20:39 red-controller kernel: TRACE: filter:INPUT:rule:2 IN=tap9e45dcab-8a OUT= MAC=72:72:93:96:d6:b9:fa:16:3e:c7:2c:d8:08:00 SRC=10.0.1.5 DST=10.0.1.2 LEN=84 TOS=0x00 PREC=0x00 TTL=64 ID=3940 PROTO=ICMP TYPE=0 CODE=0 ID=3545 SEQ=1
Sep 9 15:20:39 red-controller kernel: TRACE: filter:neutron-l3-agent-INPUT:return:2 IN=tap9e45dcab-8a OUT= MAC=72:72:93:96:d6:b9:fa:16:3e:c7:2c:d8:08:00 SRC=10.0.1.5 DST=10.0.1.2 LEN=84 TOS=0x00 PREC=0x00 TTL=64 ID=3940 PROTO=ICMP TYPE=0 CODE=0 ID=3545 SEQ=1
Sep 9 15:20:39 red-controller kernel: TRACE: filter:INPUT:rule:3 IN=tap9e45dcab-8a OUT= MAC=72:72:93:96:d6:b9:fa:16:3e:c7:2c:d8:08:00 SRC=10.0.1.5 DST=10.0.1.2 LEN=84 TOS=0x00 PREC=0x00 TTL=64 ID=3940 PROTO=ICMP TYPE=0 CODE=0 ID=3545 SEQ=1
Sep 9 15:20:39 red-controller kernel: TRACE: filter:nova-api-INPUT:return:2 IN=tap9e45dcab-8a OUT= MAC=72:72:93:96:d6:b9:fa:16:3e:c7:2c:d8:08:00 SRC=10.0.1.5 DST=10.0.1.2 LEN=84 TOS=0x00 PREC=0x00 TTL=64 ID=3940 PROTO=ICMP TYPE=0 CODE=0 ID=3545 SEQ=1
Sep 9 15:20:39 red-controller kernel: TRACE: filter:INPUT:policy:12 IN=tap9e45dcab-8a OUT= MAC=72:72:93:96:d6:b9:fa:16:3e:c7:2c:d8:08:00 SRC=10.0.1.5 DST=10.0.1.2 LEN=84 TOS=0x00 PREC=0x00 TTL=64 ID=3940 PROTO=ICMP TYPE=0 CODE=0 ID=3545 SEQ=1

Revision history for this message
Xiang Hui (xianghui) said : 		#2

If you want to ping vm, add this security-group-rule:

nova secgroup-add-rule default icmp -1 -1 CIDR(for example 56.0.0.0/24)
default is the default security group.

Revision history for this message
Florine Fontenot (florinefontenot) said : 		#3

When people start using OpenStack, they often have problems pinging the outside world from their instances.

Here are the reasons and how I came up with my method of communicating with my OpenStack instances.

Since CentOS is my operating system of choice, I disabled SELinux and iptables just as any other developer would do. They tend to cause problems in my experience.

https://basketballgem.com/ write an article that they eventually realized, however, that OpenStack is required to run iptables after days of struggling with OpenStack networking. SELinux must likewise be set to permissive mode instead of being turned off completely.

According to the research, OpenStack uses IPtables rules to implement security groups on devices such as vnet0 and Open vSwitch is not compatible with IPtables rules applied directly to the device. Here is a detailed explanation of what that means.

Can you help with this problem?

Provide an answer of your own, or ask Zhen for more information if necessary.

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