> On 26 Jun 2015, at 20:11, Michael Brown <[email protected]> wrote: > > On 26/06/15 18:55, Josh Jameson wrote: >> I am having an issue where I need to provide /32 DHCP request where the >> gateway is outside the subnet. >> >> For example consider the following DHCP offer; >> IP: 10.0.0.50 >> Netmask: 255.255.255.255 >> Gateway: 10.1.0.1 >> >> iPXE doesn't seem to communicate right. It times out when trying to get >> a HTTP request at http://10.1.0.1/. > > That doesn't surprise me. By specifying a subnet mask of 255.255.255.255, > you are telling iPXE (or any other client) that there is one and only one IP > address on that network, which is the 10.0.0.50 address itself. You have not > provided any way for the client to reach 10.1.0.1. > >> If I boot the same machine and >> network config into Linux or Windows I can access the URL. > > That _does_ surprise me. I tested it just now: as expected, Linux fails to > communicate with 10.1.0.1. (Specifically, it refuses to even add 10.1.0.1 as > the default gateway, since that address is not within the designated local > network range of 10.0.0.50-10.0.0.50). > > I'm not sure what network topology you're actually trying to create. Is the > iPXE client in the same broadcast domain as the gateway (i.e. if you send a > broadcast such as an ARP request from the iPXE node, do you expect it to > reach the gateway)? If so, then you are probably using a subnet mask of > 255.0.0.0. > > See https://en.wikipedia.org/wiki/Subnetwork#IPv4_subnetting for some basic > introduction to subnet masks.
Sorry to butt in but this is bridging And we only have half the story here - the bit that’s missing is the route commands Have a look at how OVHs explain it for virtual machines bridging to the host NIC and thus its gateway - much better than I could http://docs.ovh.ca/en/guides-network-bridging.html You CAN have the gateway outside your subnet with a /32 netmask They key is in the routing scripts AIUI Now don’t forget this is on the same NIC there is only one -- Clive Eisen GPG: 75056DD0
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