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Forum Discussion
c7000 DHCP functionality questions
How many reserved IPs can be created?
Do port forwarding entries have to be reserved IPs? That is, do I have to make an IP reservation before forwarding a port access to that IP?
If not, does the IP have to be within the DHCP range? E.g., if the DHCP range is x.x.x.50 to x.x.x.100 with mask of 255.255.255.0, can I forward to x.x.x.150, which is still within the same subnet?
Can I reserve an IP which is outside the DHCP range, but still within the subnet? E.g., same DHCP range as above, and reserving say, x.x.x.200 to assign to a particular MAC.
I ask because I have been taking advantage of Window Server DHCP, which has support for many things which apparently many routers do not. I have given up on using more than an 8 bit mask, but need other capabilities So looking for a router which has reasonable support.
5 Replies
g_fs wrote:How many reserved IPs can be created? Possible 254
Do port forwarding entries have to be reserved IPs? That is, do I have to make an IP reservation before forwarding a port access to that IP? Its always best to reserve an IP address so the IP doesn't change.
If not, does the IP have to be within the DHCP range? E.g., if the DHCP range is x.x.x.50 to x.x.x.100 with mask of 255.255.255.0, can I forward to x.x.x.150, which is still within the same subnet? I believe it can.
Can I reserve an IP which is outside the DHCP range, but still within the subnet? E.g., same DHCP range as above, and reserving say, x.x.x.200 to assign to a particular MAC. You can only set IP address reservations with in the IP address pool range. Anything outside the pool range is meant for static IP addressed devcies that are set ON devices. Not set on the router.
I ask because I have been taking advantage of Window Server DHCP, which has support for many things which apparently many routers do not. I have given up on using more than an 8 bit mask, but need other capabilities So looking for a router which has reasonable support.
Home class gateway routers are limited in most operations, unlike MS Server, and there designed and meant for simple house holds and average users. Most users just want good internet service and wifi connections. If you want more features and support like you see in Windwos Server, then you'll need to use MS server for find a router that has more features like it. Routers with DD-WRT/OpenWRT loaded may also have more features as well.
> How many reserved IPs can be created?
I don't know. Around here (D7000[v1], V1.0.1.78_1.0.1), I've seen
no problems with 23.> Do port forwarding entries have to be reserved IPs? [...]
They need to be fixed, somehow: Reserved (dynamic) or static. If the
address is not fixed in some way, then the port-forwarding rules could
be(come) invalid.> [...] does the IP have to be within the DHCP range? [...]
This should not be necessary. Around here, all my reserved and
static addresses are outside the DHCP pool. I have a very small pool,
".224" - ".239". (Currently, my only DHCP pool user is a Roku box.)> [...] looking for a router which has reasonable support.
Define "reasonable". The biggest complaints I recall seeing here
involve the inability to specify a DNS server or gateway other than the
router itself.> Model: C7000|Nighthawk - AC1900 WiFi Cable Modem Router
The limits on your model may differ.
Thanks for the info. Yes, static addresses, but not always allocated by the router, given the limits they have.
I got stuck with a Cisco business gateway which refuses to do any port forwarding to an internal IP for which it does not have a static address reservation, and the address must be within the DHCP range, not just on the same subnet. And it has a severe limit on the number of reservations. Port translation is out of the question.
I had not considered OpenWRT, as suggested previously. Many of the devices supported are old and/or discontinued. Makes sense, as creating the support using a volunteer community takes time.
Just keep this in mind. Dynamic is addresses given by a router. IP Reserverations are set ON the router with in the routers DHCP IP address pool. SO devices keep and maintain same IP address all the time. Static IP addresses are manual IP addresses entered on to devices. Not given by the router and reside outside of the DHCP IP address pool on the router. Also keeps same IP address ON devices all the time.
