You have two network namespaces: Red and Blue. Create the following interfaces: Main interface: veth-red Peer interface: veth-blue Link type: veth peer

ip link add veth-red type veth peer name veth-blue

Type the full command to attach the veth-blue virtual interface to the network namespace "blue".

ip link set veth-blue netns blue

Type the full command to add the IP address 192.168.15.1/24 to the veth-red virtual interface within the network namespace "red".

ip -n red addr add 192.168.15.1/24 dev veth-red

Type the full command to add the IP address 192.168.15.2/24 to the veth-blue virtual interface within the network namespace "blue".

ip -n blue addr add 192.168.15.2/24 dev veth-blue

Type the full command to bring the virtual interface veth-red up:

ip -n red link set dev veth-red up

Type the full command to ping from virtual interface at red network namespace to the virtual interface at blue network namespace

ip netns exec red ping 192.168.15.2

What options work better when we have only two network namespaces and we want them to communicate each other?

Create virtual ethernet interfaces

What options work better when we have multiple network namespaces and we want them to communicate one other?

Create virtual ethernet interfaces

Type the full command to create a bridge interface in the host so it can work as a virtual switch. The name of the bridge interface should be v-net-0

ip link add v-net-0 type bridge

This is a scenario with multiple nodes. Create the following interfaces: Main virtual interface: veth-red Peer interface: veth-red-br Link type: veth peer.

ip link add veth-red type veth peer name veth-red-br

Type the full command to bind the virtual interface "veth-red-br" with the network bridge "v-net-0" interface.

ip link set veth-red-br master v-net-0

Type the full command to set the IP address 192.168.15.1/24 to the virtual interface "veth-red" , which belong to the "red" network namespace.

ip -n red addr add 192.168.15.1/24 dev veth-red

Type the full command to add the IP address 192.168.15.5/24 to the "v-net-0" bridge interface of the host.

ip addr add 192.168.15.5/24 dev v-net-0

Analyze the attached image. Create a route on the routing table of the blue network namespace to reach external network (192.168.1.0/24) .

ip netns exec blue ip route add 192.168.1.0/24 via 192.168.15.5

NAT has been configured and we have connection from the blue namespace to the LAN network, and vice versa. Type the full command to add a default route on the routing table of the blue namespace . In this way any packet going to any network (including the internet) will be sent through the gateway (192.168.15.5)

ip netns exec blue ip route add default via 192.168.15.5

Analyze the attached image. Create a NAT rule at the host level in order to translate any outgoing connection from the internal network 192.168.15.0/24 to the IP address of the outgoing network interface 192.168.1.2

iptables -t nat -A POSTROUTING -s 192.168.15.0/24 -j MASQUERADE

What component should be configured in Kubernetes to enable outgoing and incoming connections in a network namespace?

Network Address Translation (NAT)

Role-Based Access Control (RBAC)

In order to received external connections to the blue network namespace we need to create another NAT rule with the following information: -Destination port: 80 -Destination IP : 192.168.15.2:80 In this way, any incoming connection on port 80 of the host is forwarded to the same port in the internal IP of the blue namespace.

iptables -t nat -A PREROUTING --dport 80 -j DNAT --to-destination 192.168.15.2:80

Section 9: Networking (1-6)

Authored by Maiky Alfaro

Computers

University

Used 7+ times

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FILL IN THE BLANKS QUESTION

1 min • 1 pt

What Linux file should be set with "1" to allow packets forwarding in Linux network interface cards?
Type the full path:

(a)

FILL IN THE BLANKS QUESTION

1 min • 1 pt

To allow packets forwarding in Linux network interface cards we should edit the file at (a) by adding "net.ipv4.ip_forward = 1" in order to apply this change in persistent way across system restarts:

MULTIPLE SELECT QUESTION

45 sec • 1 pt

CoreDNS binaries can be downloaded from:

Docker images

GitHub releases

Linux tarballs

Linux repositories

FILL IN THE BLANKS QUESTION

1 min • 1 pt

What's the file used to configure internal name resolution in Linux?
Type the absolute path.

(a)

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What file should be configured to be used by CoreDNS and that contains the hostname mapping?

/etc/coredns.cfg

/etc/coredns/hosts

/etc/hosts

/etc/coredns/Corefile

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What's the main CoreDNS config file?

/etc/coredns.cfg

/etc/coredns/hosts

/etc/hosts

/etc/coredns/Corefile

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

__________________ are used by containers like Docker, to implement network isolation.

Network containers

Network groups

Network namespaces

Pod networking

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Section 9: Networking (1-6)

What Linux file should be set with "1" to allow packets forwarding in Linux network interface cards?
Type the full path:

(a)

To allow packets forwarding in Linux network interface cards we should edit the file at (a) by adding "net.ipv4.ip_forward = 1" in order to apply this change in persistent way across system restarts:

CoreDNS binaries can be downloaded from:

What's the file used to configure internal name resolution in Linux?
Type the absolute path.

(a)

What file should be configured to be used by CoreDNS and that contains the hostname mapping?

What's the main CoreDNS config file?

__________________ are used by containers like Docker, to implement network isolation.

Do the container can have its own virtual interfaces, routing and ARP tables within namespaces?

Type the full command you'd run to create a new network namespace called "red":

(a)

Type the full command to list all network namespaces:

(a)

Access all questions and much more by creating a free account

Similar Resources on Wayground

Popular Resources on Wayground

Section 9: Networking (1-6)

What Linux file should be set with "1" to allow packets forwarding in Linux network interface cards?Type the full path: (a)

To allow packets forwarding in Linux network interface cards we should edit the file at (a) by adding "net.ipv4.ip_forward = 1" in order to apply this change in persistent way across system restarts:

CoreDNS binaries can be downloaded from:

What's the file used to configure internal name resolution in Linux?Type the absolute path. (a)

What file should be configured to be used by CoreDNS and that contains the hostname mapping?

What's the main CoreDNS config file?

__________________ are used by containers like Docker, to implement network isolation.

Do the container can have its own virtual interfaces, routing and ARP tables within namespaces?

Type the full command you'd run to create a new network namespace called "red": (a)

Type the full command to list all network namespaces: (a)

Access all questions and much more by creating a free account

Similar Resources on Wayground

Popular Resources on Wayground

What Linux file should be set with "1" to allow packets forwarding in Linux network interface cards?
Type the full path:

(a)

What's the file used to configure internal name resolution in Linux?
Type the absolute path.

(a)

Type the full command you'd run to create a new network namespace called "red":

(a)

Type the full command to list all network namespaces:

(a)