issue: 3382805 Fixing incorrect handling of src field of IPv4 routing

[AlexanderGrissik]

Description

Fix usage of src routing field of IPv4

What

The src field should be used for src address selection only (As done for IPv6) and not as identifying interfaces or routing decisions. This eliminates incorrect behavior and warnings such as "could not figure out source ip for rtv".

Why ?

Functionality

Change type

What kind of change does this PR introduce?

• [X] Bugfix
• [ ] Feature
• [ ] Code style update
• [ ] Refactoring (no functional changes, no api changes)
• [ ] Build related changes
• [ ] CI related changes
• [ ] Documentation content changes
• [ ] Tests
• [ ] Other

Check list

• [X] Code follows the style de facto guidelines of this project
• [X] Comments have been inserted in hard to understand places
• [ ] Documentation has been updated (if necessary)
• [ ] Test has been added (if possible)