Our CM cluster is a windows based 4.2 (sr1) = 1x PUB and 1 x SUB and we will soon be upgrading it to 6.1. For this we will have entirely new and separate Linux servers running 6.1 and I am setting up the 6.1's in a test environment first for testing purposes before the actual cutover. The 4.2's will be removed post-cutover. I am planning to give the 6.1's an ip address from the same subnet range as the existing (live) 4.2 PUB and SUB. My questions are:
1. would having the 4.2 (live) and the 6.1 (test) clusters on the same subnet pose a problem i.e can they co-exist simultaneously?
2. I understand that the administrator name cannot be changed without reinstalling the OS but can I change the 6.1's ip address and the server name's later on without re-installing the OS?
All suggestions will be greatly appreciated.