On 2/10/2019 11:45 PM, Boris Ouretskey wrote:
Hi I am trying to set up GRE tunnel between OVS switches on a single
machine. For that I have run simple *_mininet topology _*with two
hosts running in container connected to two different OVS switches.
Outside of container, I have configured GRE endpoint for each switch
created by mininet and assigned ip's to internal switch ports.
In general it looks like theat
[h1 host mininet container ip = 10.0.0.1]-->s1 switch[s1 port ip =
12.0.0.1, gre:remote_ip=12.0.0.2]
[h2 host mininet container ip = 10.0.0.2]-->s2 switch[s2 port ip =
12.0.0.2, gre:remote_ip=12.0.0.1]
I would expect GRE encapsulated packets to be routed from s1 to s2 and
vice versa. However the behavior that I observe is that GRE
encapsulated the packets (eventually ARP) _have the same source and
destination ip address_ (if pinging from h2 it would be 12.0.0.1) and
not reaching anywhere.
@ubuntu:~$ sudo ovs-vsctl show
...
Bridge "s2"
fail_mode: standalone
Port "gre2"
Interface "gre2"
type: gre
options: {remote_ip="12.0.0.1"}
Port "s2"
Interface "s2"
type: internal
Port "s2-eth1"
Interface "s2-eth1"
Bridge "s1"
fail_mode: standalone
Port "gre1"
Interface "gre1"
type: gre
options: {remote_ip="12.0.0.2"}
Port "s1-eth1"
Interface "s1-eth1"
Port "s1"
Interface "s1"
type: internal
ovs_version: "2.10.90"
@ubuntu:~$ ifconfig s2
s2 Link encap:Ethernet ...
inet addr:12.0.0.2 Bcast:0.0.0.0 Mask:255.255.255.0
@ubuntu:~$ ifconfig s1
s1 Link encap:Ethernet ...
inet addr:12.0.0.1 Bcast:0.0.0.0 Mask:255.255.255.0
I can see GRE packets in wireshark but only when listening on any
interface where it appears as "Linux cooked capture"
It doesn't appear to me that you have the ip addresses for s1 and s2
isolated to a container. IP addresses belong to the system, not the
interface so that's your problem.
Check system-traffic.at for examples on how to isolate interfaces to
namespaces (containers), that will help you out.
- Greg
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