Two VMWare ESXi hosts, each with 2 10GB NIC Storage with 2 10GB NIC
Where's the storage?
how would the ESXi hosts communicate with the LAN?
The host should use dedicated NICs for LAN and SAN. For a fully redundant connection you need at least two NICs (each via a separate switch). Depending on your redundancy requirement, that means a minimum of four NICs ...
It is a university and they own a /16 network and a /24: https://bgp.he.net/AS3634
They also have their own AS (AS3634) so in layman terms they are the own ISP.
You could even block/restrict the whole range by CIDR although I prefer the surgical approach. The most reasonable is to restrict the offending IP address first, and see if the abuse persists.
If you ...
That depends on their ISP data plan.
Many businesses use static IP addresses that never change, but many others haven't fixed that with their ISP and their IP address may change on a daily basis, on router reboot, or some other occasion.
Your guess is a guess. You should clarify this question with the respective organization.
As to security: of course, any ...
There are a number of misunderstandings in your question:
Did they just write this block belong to this RIR, this other block belong to that RIR, etc...
That is all that the IANA does (at least in respect of IP blocks), it does not have servers or routers that manage transfer of data to or from said IP blocks.
and RIRs like "Yeah, when we send ...
To expand on @Zac67... RFC791 is pointing out fragmentation can happen at layer-2 or layer-1. Such fragmentation (and reassembly) would be invisible to any higher layer protocols. This is an important distinction as the IP "DF" (do-not-fragment) flag does not apply to other layers.
Such fragmentation is rare. For example, MLPPP (multi-link PPP) can ...
Re RFC 791: it's the fragmentation, transmission and reassembly that may be invisible to a node's IP stack, not the local network itself.
That internet protocol module is usually called IP stack today. It's the functionality that enables connectivity to a local network. Back in 1981 it was entirely external to the system being networked. For a long time now (...
If destination host is within LAN network :-
When packet goes to LAYER2 OSI arpa give payload to arp if finding ip is within a LAN network ARP is generated with sender Mac :- 0.0.0.0 which means not known and then this arpa goes to LAYER2 ARPA, ARPA made a Ethernet II frame in which frame is encapsulated with senader Mac FFFF.FFFF.FFFF which means ...
When a device tries to associate an IP address with a MAC address for a given device, it sends ARP requests to all devices connected to the same network.
For IPv4 that's correct. IPv6 uses the Neighbor Discovery Protocol (NDP).
how does the searching device find the MAC addresses of the other devices in the first place?
It doesn't. ARP uses the link-layer ...
When a device tries to associate an IP address with a MAC address for
a given device, it sends ARP requests to all devices connected to the
It is really a device trying to discover the MAC address for a given IPv4 address (IPv6 uses NDP).
My question is this: how does the searching device find the MAC
addresses of the other devices in the ...
An IP address is an IP address. Public and Private are artificial labels. What makes an address "private" is a loose agreement that no one will route it over the public internet. However, within one's own network, one may do whatever they wish. While it's a bad practice to mix private and public traffic, there's nothing logically wrong with it. &...
Yes, it is possible, but requires support from the operating system. You've also got to ensure packets for the affected TCP connection are directed to the right host post-connection-migration.
This topic is a bit outside the scope of the Network Engineering Stack Exchange. However, I didn't find any other good-quality posts on other SXes, either.
I found the solution to this eventually, with some help.
The issue was that on the ASR side, the tunnel was in its default configuration which uses GRE, which the ASA doesn't support.
The solution was to change the tunnel mode to ipsec ipv4 like so:
tunnel mode ipsec ipv4
With this done, bidirectional traffic was possible over the tunnel.