what are different reasons for having mulitple ip addresses on a server

what are different reasons for having mulitple ip addresses on a server

excluding seo (need a separate ip address for every domain name),  ssl (needs its own ip address)
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cfEngineersConnect With a Mentor Commented:
you can use multiple ip addresses for firewalls

also to bind an address to a website

please note SEO you do not need to have a seperate ip for each domain you can use host header compression instead.
Beverley PortlockConnect With a Mentor Commented:
Mulitple IP addresses are commonly used because Apache needs to distinguish traffic on port 443 (https) which is tied to a given server name (domain) but with the latest release of Apache there is a new feature called Server Name Indication. Many Apache servers are configured on the basis of server name AND an IP address and both must match up. When buying SSL certificates you do not have to disclose an IP address - at least I have never done so.

SEO does NOT need a separate IP address for every domain name.
Dave BaldwinConnect With a Mentor Fixer of ProblemsCommented:
SSL is based on domain name but the process (at least historically) required the domain to resolve to a unique IP address.
rgb192Author Commented:
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