Mastering curl, wget, and Linux Bonding with nmcli: Essential Commands

curl

curl

is a command-line tool for transferring data with servers, supporting protocols such as HTTP, HTTPS, FTP, and more.

Basic usage

Get webpage content : curl http://example.com Download file : curl -O http://example.com/file.zip Save file with specific name : curl -o myfile.zip http://example.com/file.zip Test port : curl -v ip:port Limit download speed :

curl --limit-rate 100K http://example.com

wget

wget

is a command-line utility for downloading files from the web, supporting HTTP, HTTPS, and FTP.

Basic usage

Download file : wget http://example.com/file.zip Download and save as specific filename : wget -O myfile.zip http://example.com/file.zip Background download : wget -b http://example.com/file.zip Show progress bar : wget --progress=bar http://example.com/file.zip Download specific file types (e.g., all PDFs) :

wget -r -A pdf http://example.com

bond

Linux bonding modes:

mode=0 (Round-robin) : distributes outbound traffic evenly across all NICs, increasing bandwidth.

mode=1 (Active-backup) : only one NIC is active; a backup takes over if the active fails.

mode=2 (XOR) : uses MAC address hash to assign traffic to NICs.

mode=3 (Broadcast) : sends packets to all NICs, providing high availability without bandwidth gain.

mode=4 (802.3ad) : dynamic link aggregation using LACP.

mode=5 (TLB – Adaptive Transmit Load Balancing) : outbound traffic balanced adaptively; inbound uses primary NIC.

mode=6 (ALB – Adaptive Load Balancing) : combines TLB and ARP monitoring for bidirectional load balancing.

nmcli configure bond

1. Create bond interface
nmcli connection add type bond con-name bond0 ifname bond0 mode active-backup miimon 100

2. Add slave NICs
nmcli connection add type bond-slave con-name bond0-slave1 ifname ens224 master bond0
nmcli connection add type bond-slave con-name bond0-slave2 ifname ens256 master bond0

3. Configure static IP
nmcli connection modify bond0 ipv4.addresses 192.168.5.130/24 ipv4.gateway 192.168.5.1 ipv4.dns "8.8.8.8" ipv4.method manual

4. Configure DHCP
nmcli connection modify bond0 ipv4.method auto

5. Activate connections
nmcli connection up bond0
nmcli connection up bond0-slave1
nmcli connection up bond0-slave2

6. Check bond status
cat /proc/net/bonding/bond0

nmcli configure regular NIC

1. List interfaces
nmcli device

2. Create new Ethernet connection
nmcli connection add type ethernet ifname eth0 con-name eth0

3. Set static IP
nmcli connection modify ens8 ipv4.addresses 192.168.5.110/24
nmcli connection modify ens8 ipv4.gateway 192.168.5.1
nmcli connection modify ens8 ipv4.dns 8.8.8.8
nmcli connection modify ens8 ipv4.method manual

4. Enable DHCP
nmcli connection modify my-ethernet ipv4.method auto

5. Show active connections
nmcli connection show --active