iSCSI on SUSE/openSUSE - Network Configuration

Network Configuration Methods

YaST (Recommended for SUSE):

• GUI and CLI management

• Integrated system configuration

• Consistent across SUSE products

wicked (Default network manager):

• SUSE's network configuration framework

• XML-based configuration

• Replaces traditional ifcfg files

NetworkManager (Alternative):

• Available but not default

• Good for desktop environments

Storage Network Configuration with YaST

Using YaST CLI:

# Configure storage interface with YaST
sudo yast lan add name=storage-iscsi-1 \
    ethdevice=ens1f0 \
    bootproto=static \
    ipaddr=10.100.1.101/24 \
    mtu=9000 \
    startmode=auto

sudo yast lan add name=storage-iscsi-2 \
    ethdevice=ens1f1 \
    bootproto=static \
    ipaddr=10.100.2.101/24 \
    mtu=9000 \
    startmode=auto

# Apply configuration
sudo systemctl restart wicked

Using YaST GUI:

# Launch YaST network configuration
sudo yast lan

# Follow GUI to:
# 1. Add new interface
# 2. Set static IP
# 3. Set MTU to 9000
# 4. Set to start on boot
# 5. Apply configuration

Storage Network Configuration with wicked

Create wicked configuration files:

# Create configuration for first storage interface
sudo tee /etc/sysconfig/network/ifcfg-ens1f0 > /dev/null <<'EOF'
BOOTPROTO='static'
STARTMODE='auto'
IPADDR='10.100.1.101/24'
MTU='9000'
NAME='Storage iSCSI 1'
EOF

# Create configuration for second storage interface
sudo tee /etc/sysconfig/network/ifcfg-ens1f1 > /dev/null <<'EOF'
BOOTPROTO='static'
STARTMODE='auto'
IPADDR='10.100.2.101/24'
MTU='9000'
NAME='Storage iSCSI 2'
EOF

# Restart wicked
sudo systemctl restart wicked

# Verify
ip addr show ens1f0
ip addr show ens1f1

Key wicked parameters:

• BOOTPROTO='static' - Static IP configuration

• STARTMODE='auto' - Start on boot

• MTU='9000' - Jumbo frames

MTU Configuration

# Verify MTU
ip link show ens1f0 | grep mtu

# Test MTU (jumbo frames)
ping -M do -s 8972 <storage_portal_ip>

# If using wicked, MTU is set in ifcfg file
# If using YaST, MTU can be set in GUI or CLI