Search found 1820 matches

by jlehtone
2017/10/16 05:01:36
Forum: CentOS 6 - General Support
Topic: Loopback Interface
Replies: 1
Views: 25

Re: Loopback Interface

Loopback is special. Loopback must always be there. There is exactly one lo.

If you want to stop a regular interface manually, for example eth1:

Code: Select all

ifdown eth1
by jlehtone
2017/10/14 13:14:48
Forum: CentOS 7 - Networking Support
Topic: centos 7 as a router?
Replies: 11
Views: 205

Re: centos 7 as a router?

Good, we are making progress. My bad trying to put each subnet down on the diagram makes me head want to explode Do not worry. I know that feeling. We can pretty much ignore the other subnets; a solution that works for one, should work for all. Now I realized I was referring to a logical topology wo...
by jlehtone
2017/10/13 20:51:15
Forum: CentOS 7 - Networking Support
Topic: centos 7 as a router?
Replies: 11
Views: 205

Re: centos 7 as a router?

They are Hardware Firewalls. Google "HA firewall". You should find active/backup fw tutorials for Ubuntu, Sophos, and some "hardware" brands. In most the two firewalls monitor each other and when the active goes down, the backup activates. Not only that, but it takes over the IP...
by jlehtone
2017/10/13 07:17:50
Forum: CentOS 7 - General Support
Topic: Installation with LVM : /boot can't be on LVM
Replies: 10
Views: 184

Re: Installation with LVM : /boot can't be on LVM

It's a GRUB Limtation in CentOS ? I already installed (for my personal use in a virtual machine) an other Linux with GRUB2 and LVM without /boot separated partition. CentOS 7 has GRUB2. Perhaps not the same version as "other Linux", but a 2 nevertheless. The question is: Who does what? Le...
by jlehtone
2017/10/13 06:45:47
Forum: CentOS 7 - Networking Support
Topic: centos 7 as a router?
Replies: 11
Views: 205

Re: centos 7 as a router?

OK. Lets forget HA redundancy for a moment still. Your pictures have a firewall and a router between ISP WAN and OffLAN. Two side-by-side routes. Why? Why does the INET has a choice to try access OffLAN either via RTR or Firewall? On consumer setups the outer firewall is in the router device. Outsid...
by jlehtone
2017/10/12 12:59:22
Forum: CentOS 7 - Networking Support
Topic: centos 7 as a router?
Replies: 11
Views: 205

Re: centos 7 as a router?

Lets see if I read those right: * There is a subnet in the "office". I call it OffLAN. * There is/are datacenter subnet(s). HPClan. (Assuming routed link. One could extend OffLAN to datacenter via bridged MPLS.) * There is external Tech Support group with their TSlan subnet. * The OffLAN h...
by jlehtone
2017/10/12 09:12:10
Forum: CentOS 7 - Networking Support
Topic: Centos 7 routing doesn't keep source IP
Replies: 1
Views: 98

Re: Centos 7 routing doesn't keep source IP

Interesting. Base case: # tcpdump -nn -vv -i eth0 host 8.8.8.8 tcpdump: listening on eth0, link-type EN10MB (Ethernet), capture size 262144 bytes 11:58:57.190698 IP (tos 0x0, ttl 64, id 6295, offset 0, flags [DF], proto ICMP (1), length 84) 10.0.0.10 > 8.8.8.8: ICMP echo request, id 6067, seq 1, len...
by jlehtone
2017/10/11 12:26:37
Forum: CentOS 7 - Networking Support
Topic: centos 7 as a router?
Replies: 11
Views: 205

Re: centos 7 as a router?

How would you make it be a router in the following network topology?

Is that a list of physical connections? What is the logical topology that has to be achieved?
by jlehtone
2017/10/11 12:22:38
Forum: CentOS 7 - General Support
Topic: gcc4.4 build error on Centos7
Replies: 28
Views: 775

Re: gcc4.4 build error on Centos7

This is the output of "Helloworld" program , actuallly i dont want to strip in centos6 . When i compile in centos7 (gcc4.8) i should get a binary of size that is same as that of centos 6(gcc4.4) You want to strip in centos 6. Not the used binary, but a temporary copy of it. You want to kn...
by jlehtone
2017/10/11 11:18:05
Forum: CentOS 6 - Networking Support
Topic: How to prevent interface name changes?
Replies: 9
Views: 269

Re: How to prevent interface name changes?

Why? I just wrote that I've seen a functional setup, where the host NIC kept it's MAC and a VM used that NIC with different MAC (in some passthrough mode). You say that something requires passthrough. Fine, passthrough (although you have not told which; there are many). What does that have to do wit...