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Chapter 18. Networking
Review the most notable changes to networking between RHEL 9 and RHEL 10.
- Network team driver was removed
The
teamdservice and thelibteamlibrary were removed in Red Hat Enterprise Linux 10. As a replacement, configure a bond instead of a network team.Red Hat focuses its efforts on kernel-based bonding to avoid maintaining two features, bonds and teams, that have similar functions. The bonding code has a high customer adoption, is robust, and has an active community development. As a result, the bonding code receives enhancements and updates.
If you use RHEL 9 with a network team and plan to upgrade to RHEL 10, migrate the network team configuration to network bond before you upgrade.
- Removed support for network configuration files in the ifcfg format
-
Starting with RHEL 9.0, RHEL stored newly created network configurations in a key file format in the
/etc/NetworkManager/system-connections/directory. The connections, for which the configurations had already been stored from previous times in the/etc/sysconfig/network-scripts/directory in the old ifcfg format still worked uninterrupted. However, with the RHEL 10 release, the support for the ifcfg format based network configuration files was removed. - The
dhclientutility was removed -
The
dhclientutility is a client program used to obtain IP addresses, network configuration, and other information from a DHCP server. Sincedhclientis no longer developed as of early 2022, the utility was removed in Red Hat Enterprise Linux 10. As a consequence of the removal, you can no longer setdhcp=dhclientin/etc/NetworkManager.conf. As a replacement, use thedhcp=internal(default) in your NetworkManager configuration. - Removed NIC device drivers related to iPXE
Internet Preboot eXecution Environment (iPXE) firmware provides a range of boot options over a network often used in environments, where machines need to boot remotely. Among others, it contains a large number of device drivers. With the RHEL 10 release, the following will be removed:
-
The complete
ipxe-romssub-RPM package Binary files containing device drivers from
ipxe-bootimgs-x86sub-RPM package:-
/usr/share/ipxe/ipxe-i386.efi -
/usr/share/ipxe/ipxe-x86_64.efi -
/usr/share/ipxe/ipxe.dsk -
/usr/share/ipxe/ipxe.iso -
/usr/share/ipxe/ipxe.lkrn -
/usr/share/ipxe/ipxe.usb
-
Instead, iPXE now depends on the platform firmware to provide a NIC driver for the network boot. The
/usr/share/ipxe/ipxe-snponly-x86_64.efiand/usr/share/ipxe/undionly.kpxeiPXE binary files are the part of theipxe-bootimgspackage and use the NIC driver provided by the platform firmware.-
The complete
NetworkManager-initscripts-updownis not available-
The
NetworkManager-initscripts-updownsub-package is removed in RHEL 10 because the relatednetwork-scriptspackage had already been removed in RHEL 9. - Moving some kernel modules to
kernel-modules-extra All kernel modules related to the following utilities have been moved to the
kernel-modules-extrapackage:-
iptables -
ip6tables -
ipset -
ebtables -
arptables
-
- ATM encapsulation has been removed
- Asynchronous Transfer Mode (ATM) encapsulation enables Layer-2 (Point-to-Point Protocol, Ethernet) or Layer-3 (IP) connectivity for the ATM Adaptation Layer 5 (AAL-5). In RHEL 9, the ATM implementation was unsupported and deprecated. In RHEL 10, the kernel feature has been disabled in the kernel, and ATM is no longer available.
- The
PF_KEYv2kernel API has been removed -
In earlier RHEL versions, applications could configure the kernel’s IPsec implementation by using the deprecated
PV_KEYv2and the newernetlinkAPI.PV_KEYv2has not been actively maintained upstream and is missing important security features, such as modern ciphers, offload, and extended sequence number support. As a result, thePV_KEYv2API has been removed in RHEL 10. If you used this kernel API in applications, migrate your applications to use the modernnetlinkAPI as an alternative. - The
firewalldlockdown feature has been removed -
The
firewalldlockdown feature could not prevent processes that are running asrootfrom adding themselves to the allow list. In RHEL 10, this feature has been removed.
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