Configuring network interfaces

Question

Debian

Tell me, on the server is Proxmox
external ip xx.xx.xx.45 received another external xx.xx.xx.39
At 45 ip ssl hangs for one site, at 39 I want to hang ssl for another site, how to configure?

eth0 Link encap:Ethernet HWaddr XX:XX:XX:XX:XX:XX
inet addr:xx.xx.xx.45 Bcast:xx.xx.xx.63 Mask:255.255.255.224
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric: 1
RX packets:424377073 errors:0 dropped:0 overruns:0 frame:0
TX packets:531325597 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:93836072677 (87.3 GiB) TX bytes: 456827123070 (425.4 GiB)
Interrupt:33 Base address:0xc000

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:42949132 errors:0 dropped:0 overruns:0 frame:0
TX packets:42949132 errors:0 dropped:0 overruns:0 carrier :0
collisions:0 txqueuelen:0
RX bytes:7858210256 (7.3 GiB) TX bytes:7858210256 (7.3 GiB)

venet0 Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00- 00-00-00-00-00-00
UP BROADCAST POINTOPOINT RUNNING NOARP MTU:1500 Metric:1
RX packets:16829843783 errors:0 dropped:0 overruns:0 frame:0
TX packets:16705995066 errors:0 dropped:33 overruns: 0 carrier:0
collisions:0 txqueuelen:0
RX bytes:11256779410229 (10.2 TiB) TX bytes:10590464308357 (9.6 TiB)

vmbr0 Link encap:Ethernet HWaddr 00:00:00:00:00:00
inet addr:192.168.0.1 Bcast:192.168.0.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:701300 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 B) TX bytes:32870668 (31.3 MiB)

Answer 1

This has little to do with configuring network interfaces, but more so with the HTTP(S) server you are using. Read the documentation for the relevant software.

Answer 2

Offhand : wiki.debian.org/ru/NetworkConfiguration
At the bottom of the page there is an example of how to hang several L3 interfaces on one L2 interface.