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I can ping across namespaces, but not connect with TCP

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0

I'm trying to set up two network namespaces to communicate with eachother. I've set up two namespaces, ns0 and ns1 that each have a veth pair, where the non-namespaced side of the veth is linked to a bridge.

I set it up like this:

ip link add veth0 type veth peer name brveth0

ip link set brveth0 up



ip link add veth1 type veth peer name brveth1

ip link set brveth1 up



ip link add br10 type bridge

ip link set br10 up



ip addr add 192.168.1.11/24 brd + dev br10



ip netns add ns0

ip netns add ns1



ip link set veth0 netns ns0

ip link set veth1 netns ns1







ip netns exec ns0    ip addr add 192.168.1.20/24 dev veth0

ip netns exec ns0    ip link set veth0 up

ip netns exec ns0    ip link set lo up



ip netns exec ns1    ip addr add 192.168.1.21/24 dev veth1

ip netns exec ns1    ip link set veth1 up

ip netns exec ns1    ip link set lo up





ip link set  brveth0 master br10

ip link set  brveth1 master br10

As expected, I can ping the interface in ns0 from ns1.

$ sudo ip netns exec ns1 ping -c 3  192.168.1.20

PING 192.168.1.20 (192.168.1.20) 56(84) bytes of data.

64 bytes from 192.168.1.20: icmp_seq=1 ttl=64 time=0.099 ms

64 bytes from 192.168.1.20: icmp_seq=2 ttl=64 time=0.189 ms

But, I can't connect the two over TCP.

For example, running a server in ns0 :

$ sudo ip netns exec ns0 python3 -m http.server 8080

Serving HTTP on 0.0.0.0 port 8080 (http://0.0.0.0:8080/) ...

I would expect to be able to curl it from ns1, but that yields an error:

$ sudo ip netns exec ns1 curl 192.168.1.20:8080

curl: (7) Failed to connect to 192.168.1.20 port 8080: No route to host

Why is this happening?

networking bridge namespace network-namespaces veth

share|improve this question

edited 9 mins ago

Lee Avital

asked 23 mins ago

Lee AvitalLee Avital

11855 bronze badges

add a comment
 | 

0

I'm trying to set up two network namespaces to communicate with eachother. I've set up two namespaces, ns0 and ns1 that each have a veth pair, where the non-namespaced side of the veth is linked to a bridge.

I set it up like this:

ip link add veth0 type veth peer name brveth0

ip link set brveth0 up



ip link add veth1 type veth peer name brveth1

ip link set brveth1 up



ip link add br10 type bridge

ip link set br10 up



ip addr add 192.168.1.11/24 brd + dev br10



ip netns add ns0

ip netns add ns1



ip link set veth0 netns ns0

ip link set veth1 netns ns1







ip netns exec ns0    ip addr add 192.168.1.20/24 dev veth0

ip netns exec ns0    ip link set veth0 up

ip netns exec ns0    ip link set lo up



ip netns exec ns1    ip addr add 192.168.1.21/24 dev veth1

ip netns exec ns1    ip link set veth1 up

ip netns exec ns1    ip link set lo up





ip link set  brveth0 master br10

ip link set  brveth1 master br10

As expected, I can ping the interface in ns0 from ns1.

$ sudo ip netns exec ns1 ping -c 3  192.168.1.20

PING 192.168.1.20 (192.168.1.20) 56(84) bytes of data.

64 bytes from 192.168.1.20: icmp_seq=1 ttl=64 time=0.099 ms

64 bytes from 192.168.1.20: icmp_seq=2 ttl=64 time=0.189 ms

But, I can't connect the two over TCP.

For example, running a server in ns0 :

$ sudo ip netns exec ns0 python3 -m http.server 8080

Serving HTTP on 0.0.0.0 port 8080 (http://0.0.0.0:8080/) ...

I would expect to be able to curl it from ns1, but that yields an error:

$ sudo ip netns exec ns1 curl 192.168.1.20:8080

curl: (7) Failed to connect to 192.168.1.20 port 8080: No route to host

Why is this happening?

networking bridge namespace network-namespaces veth

share|improve this question

edited 9 mins ago

Lee Avital

asked 23 mins ago

Lee AvitalLee Avital

11855 bronze badges

add a comment
 | 

I'm trying to set up two network namespaces to communicate with eachother. I've set up two namespaces, ns0 and ns1 that each have a veth pair, where the non-namespaced side of the veth is linked to a bridge.

I set it up like this:

ip link add veth0 type veth peer name brveth0

ip link set brveth0 up



ip link add veth1 type veth peer name brveth1

ip link set brveth1 up



ip link add br10 type bridge

ip link set br10 up



ip addr add 192.168.1.11/24 brd + dev br10



ip netns add ns0

ip netns add ns1



ip link set veth0 netns ns0

ip link set veth1 netns ns1







ip netns exec ns0    ip addr add 192.168.1.20/24 dev veth0

ip netns exec ns0    ip link set veth0 up

ip netns exec ns0    ip link set lo up



ip netns exec ns1    ip addr add 192.168.1.21/24 dev veth1

ip netns exec ns1    ip link set veth1 up

ip netns exec ns1    ip link set lo up





ip link set  brveth0 master br10

ip link set  brveth1 master br10

As expected, I can ping the interface in ns0 from ns1.

$ sudo ip netns exec ns1 ping -c 3  192.168.1.20

PING 192.168.1.20 (192.168.1.20) 56(84) bytes of data.

64 bytes from 192.168.1.20: icmp_seq=1 ttl=64 time=0.099 ms

64 bytes from 192.168.1.20: icmp_seq=2 ttl=64 time=0.189 ms

But, I can't connect the two over TCP.

For example, running a server in ns0 :

$ sudo ip netns exec ns0 python3 -m http.server 8080

Serving HTTP on 0.0.0.0 port 8080 (http://0.0.0.0:8080/) ...

I would expect to be able to curl it from ns1, but that yields an error:

$ sudo ip netns exec ns1 curl 192.168.1.20:8080

curl: (7) Failed to connect to 192.168.1.20 port 8080: No route to host

Why is this happening?

networking bridge namespace network-namespaces veth

share|improve this question

edited 9 mins ago

Lee Avital

asked 23 mins ago

Lee AvitalLee Avital

11855 bronze badges

ip link add veth0 type veth peer name brveth0

ip link set brveth0 up



ip link add veth1 type veth peer name brveth1

ip link set brveth1 up



ip link add br10 type bridge

ip link set br10 up



ip addr add 192.168.1.11/24 brd + dev br10



ip netns add ns0

ip netns add ns1



ip link set veth0 netns ns0

ip link set veth1 netns ns1







ip netns exec ns0    ip addr add 192.168.1.20/24 dev veth0

ip netns exec ns0    ip link set veth0 up

ip netns exec ns0    ip link set lo up



ip netns exec ns1    ip addr add 192.168.1.21/24 dev veth1

ip netns exec ns1    ip link set veth1 up

ip netns exec ns1    ip link set lo up





ip link set  brveth0 master br10

ip link set  brveth1 master br10

$ sudo ip netns exec ns1 ping -c 3  192.168.1.20

PING 192.168.1.20 (192.168.1.20) 56(84) bytes of data.

64 bytes from 192.168.1.20: icmp_seq=1 ttl=64 time=0.099 ms

64 bytes from 192.168.1.20: icmp_seq=2 ttl=64 time=0.189 ms

$ sudo ip netns exec ns0 python3 -m http.server 8080

Serving HTTP on 0.0.0.0 port 8080 (http://0.0.0.0:8080/) ...

$ sudo ip netns exec ns1 curl 192.168.1.20:8080

curl: (7) Failed to connect to 192.168.1.20 port 8080: No route to host

share|improve this question

edited 9 mins ago

Lee Avital

asked 23 mins ago

Lee AvitalLee Avital

11855 bronze badges

share|improve this question

edited 9 mins ago

Lee Avital

asked 23 mins ago

Lee AvitalLee Avital

11855 bronze badges

asked 23 mins ago

Lee AvitalLee Avital

11855 bronze badges

asked 23 mins ago

Lee AvitalLee Avital

11855 bronze badges