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No ICMP response for veth devices in same namespace

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I have created a veth device pair as follows in Ubuntu 16.04:

$ sudo ip link add veth1 type veth peer name veth2

$ sudo ip link set dev veth1 up

$ sudo ip link set dev veth2 up

$ sudo ip address add 10.0.10.50/24 dev veth1

$ sudo ip address add 10.0.10.51/24 dev veth2

The veth device pair is in the same namespace. I am trying to test ping from one veth device to the other. So I try the ping as follows:

$ ping -I veth1 10.0.10.51

PING 10.0.10.51 (10.0.10.51) from 10.0.10.50 veth1: 56(84) bytes of data.

From 10.0.10.50 icmp_seq=1 Destination Host Unreachable

From 10.0.10.50 icmp_seq=2 Destination Host Unreachable

From 10.0.10.50 icmp_seq=3 Destination Host Unreachable

When I check in wireshark trace for veth2, the ARP request does not get any response (similar trace is also observed for veth1):

 Broadcast  ARP 42  Who has 10.0.10.51? Tell 10.0.10.50

I want to ask why can't veth2 respond to the ICMP request when it is in the same namespace as veth1 ?

Update: If I try the ping as follows, then I get ICMP response, but wireshark shows no trace for veth1 and veth2 devices.

 $ ping -I 10.0.10.50 10.0.10.51

 PING 10.0.10.51 (10.0.10.51) from 10.0.10.50 : 56(84) bytes of data.

 64 bytes from 10.0.10.51: icmp_seq=1 ttl=64 time=0.016 ms

 64 bytes from 10.0.10.51: icmp_seq=2 ttl=64 time=0.022 ms

Can someone explain the difference in result for the two ping tests ?

networking veth

share|improve this question

edited 23 mins ago

Jake

asked 48 mins ago

JakeJake

59188 silver badges2222 bronze badges

add a comment | 

0

I have created a veth device pair as follows in Ubuntu 16.04:

$ sudo ip link add veth1 type veth peer name veth2

$ sudo ip link set dev veth1 up

$ sudo ip link set dev veth2 up

$ sudo ip address add 10.0.10.50/24 dev veth1

$ sudo ip address add 10.0.10.51/24 dev veth2

The veth device pair is in the same namespace. I am trying to test ping from one veth device to the other. So I try the ping as follows:

$ ping -I veth1 10.0.10.51

PING 10.0.10.51 (10.0.10.51) from 10.0.10.50 veth1: 56(84) bytes of data.

From 10.0.10.50 icmp_seq=1 Destination Host Unreachable

From 10.0.10.50 icmp_seq=2 Destination Host Unreachable

From 10.0.10.50 icmp_seq=3 Destination Host Unreachable

When I check in wireshark trace for veth2, the ARP request does not get any response (similar trace is also observed for veth1):

 Broadcast  ARP 42  Who has 10.0.10.51? Tell 10.0.10.50

I want to ask why can't veth2 respond to the ICMP request when it is in the same namespace as veth1 ?

Update: If I try the ping as follows, then I get ICMP response, but wireshark shows no trace for veth1 and veth2 devices.

 $ ping -I 10.0.10.50 10.0.10.51

 PING 10.0.10.51 (10.0.10.51) from 10.0.10.50 : 56(84) bytes of data.

 64 bytes from 10.0.10.51: icmp_seq=1 ttl=64 time=0.016 ms

 64 bytes from 10.0.10.51: icmp_seq=2 ttl=64 time=0.022 ms

Can someone explain the difference in result for the two ping tests ?

networking veth

share|improve this question

edited 23 mins ago

Jake

asked 48 mins ago

JakeJake

59188 silver badges2222 bronze badges

add a comment | 

I have created a veth device pair as follows in Ubuntu 16.04:

$ sudo ip link add veth1 type veth peer name veth2

$ sudo ip link set dev veth1 up

$ sudo ip link set dev veth2 up

$ sudo ip address add 10.0.10.50/24 dev veth1

$ sudo ip address add 10.0.10.51/24 dev veth2

The veth device pair is in the same namespace. I am trying to test ping from one veth device to the other. So I try the ping as follows:

$ ping -I veth1 10.0.10.51

PING 10.0.10.51 (10.0.10.51) from 10.0.10.50 veth1: 56(84) bytes of data.

From 10.0.10.50 icmp_seq=1 Destination Host Unreachable

From 10.0.10.50 icmp_seq=2 Destination Host Unreachable

From 10.0.10.50 icmp_seq=3 Destination Host Unreachable

When I check in wireshark trace for veth2, the ARP request does not get any response (similar trace is also observed for veth1):

 Broadcast  ARP 42  Who has 10.0.10.51? Tell 10.0.10.50

I want to ask why can't veth2 respond to the ICMP request when it is in the same namespace as veth1 ?

Update: If I try the ping as follows, then I get ICMP response, but wireshark shows no trace for veth1 and veth2 devices.

 $ ping -I 10.0.10.50 10.0.10.51

 PING 10.0.10.51 (10.0.10.51) from 10.0.10.50 : 56(84) bytes of data.

 64 bytes from 10.0.10.51: icmp_seq=1 ttl=64 time=0.016 ms

 64 bytes from 10.0.10.51: icmp_seq=2 ttl=64 time=0.022 ms

Can someone explain the difference in result for the two ping tests ?

networking veth

share|improve this question

edited 23 mins ago

Jake

asked 48 mins ago

JakeJake

59188 silver badges2222 bronze badges

$ sudo ip link add veth1 type veth peer name veth2

$ sudo ip link set dev veth1 up

$ sudo ip link set dev veth2 up

$ sudo ip address add 10.0.10.50/24 dev veth1

$ sudo ip address add 10.0.10.51/24 dev veth2

$ ping -I veth1 10.0.10.51

PING 10.0.10.51 (10.0.10.51) from 10.0.10.50 veth1: 56(84) bytes of data.

From 10.0.10.50 icmp_seq=1 Destination Host Unreachable

From 10.0.10.50 icmp_seq=2 Destination Host Unreachable

From 10.0.10.50 icmp_seq=3 Destination Host Unreachable

 Broadcast  ARP 42  Who has 10.0.10.51? Tell 10.0.10.50

 $ ping -I 10.0.10.50 10.0.10.51

 PING 10.0.10.51 (10.0.10.51) from 10.0.10.50 : 56(84) bytes of data.

 64 bytes from 10.0.10.51: icmp_seq=1 ttl=64 time=0.016 ms

 64 bytes from 10.0.10.51: icmp_seq=2 ttl=64 time=0.022 ms

share|improve this question

edited 23 mins ago

Jake

asked 48 mins ago

JakeJake

59188 silver badges2222 bronze badges

share|improve this question

edited 23 mins ago

Jake

asked 48 mins ago

JakeJake

59188 silver badges2222 bronze badges

asked 48 mins ago

JakeJake

59188 silver badges2222 bronze badges

asked 48 mins ago

JakeJake

59188 silver badges2222 bronze badges