Re: probably an easy routing question, so please help

On May 15, 2:55 pm, Trendkill <jpma...@xxxxxxxxx> wrote:
On May 15, 3:33 pm, pk <philip.kl...@xxxxxxxxx> wrote:



I'm not routing master, so this might be obvious, but I've been
curious about the answer to this question. Say an individual was
issued two IP blocks from their ISP.

IP Block 1 : 123.123.123.0 /28
IP Block 2 : 123.123.123.128 /28

If the individual doesn't really care to separate the two networks for
any reason and was just unfortunately issued two /28 blocks instead of
one /27 block, isn't the link between the two networks going to suffer
unnecessarily? For instance, if Server A located in Block 1 is
plugged into the same gigabit switch as Server B in Block 2 and they
want to initiate a file transfer, they are required to run out to the
default gateway (ISPs router) through a T1 (perhaps) connection and
back in when it would have been much faster for them to go directly to
the other's gigabit ethernet port on the switch? If this is the case,
would this be remedied, albeit poorly, by just subnetting both of
these ranges together into one giant class C address range? (I
understand fully that they wouldn't be able to access the rightful
owners of the rest of the IP addresses in that range as they would
search on their local LAN for them and time out, but this is a
hypothetical situation and only serves to educate myself on the
concept.) That said, how SHOULD this be handled in order to keep the
connection between the subnets optimal?

I'm quite sure that I'm missing some key concepts here, so please be
kind and explain them to me.

Thanks.

pk

Provided both of those networks are off the same edge router, and
routing is enabled, the traffic will not have to go across the WAN/
Internet link, and will instead route to the directly connected
network. This should work without issue.

OK, that makes sense, but if the uplink is coming out of the switch
from a 10Mb link to the router and the computers are both hooked into
gigabit ports then it is a big difference right? There's no way for
that switch to be a bit smarter (without turning into a router) and
not run out the 10Mb port to the router with all of its traffic,
correct? Whereas before they would have transferred at gigabit rate,
they now will be 100 times slower?

.

Relevant Pages

  • Re: Load-balancing across four T1s on 2 routers
    ... In you case (one ISP) BGP scenario will be really easy. ... switch will then see 2 UN-equal cost default routes in its routing ... directed to the router that has two operational T1s. ...
    (comp.dcom.sys.cisco)
  • Re: Load-balancing across four T1s on 2 routers
    ... since you have everything redundant (2 routers from an ISP + ... switches + firewall with failover) why ONE ISP? ... switch will then see 2 UN-equal cost default routes in its routing ... lose a T1 - you lose the "whole" router because of OSPF. ...
    (comp.dcom.sys.cisco)
  • Re: probably an easy routing question, so please help
    ... plugged into the same gigabit switch as Server B in Block 2 and they ... from a 10Mb link to the router and the computers are both hooked into ... router with gig ports, you will potentially have limits for any ...
    (comp.dcom.sys.cisco)
  • Re: probably an easy routing question, so please help
    ... plugged into the same gigabit switch as Server B in Block 2 and they ... from a 10Mb link to the router and the computers are both hooked into ... router with gig ports, you will potentially have limits for any ...
    (comp.dcom.sys.cisco)
  • Re: Does anyone know anything about routers?
    ... I actually have a WRT54G connected into my gigabyte switch because my switch ... I also use a gigabit switch to provide the connection ... players only use TX100 speeds. ... While my router and modem only function at the lower ...
    (alt.comp.periphs.mainboard.asus)