Hi, Linda,
On 10/6/2016 1:34 PM, Linda Dunbar wrote: > > Joe and Mark, > > > > > > You said “Because tunnels are links, they are subject to the same > issues as any link, e.g. MTU..” > > The MTU issue exist between any two points in a network. > A link MTU is different from a path MTU, as explained in the document. The MTU issues of a link are different than those of a path, as described. > The MTU issue for tunnel is more like the MTU issue between any two > points in the network (i.e. traverse many links, and can change over > time), less like the MTU for a single link because the single link MTU > is only determined by the fixed TWO endpoints of the link, whereas the > MTU of a tunnel (and a path) is impacted by many links in between, > i.e. more dynamic and can change depending which path the packet > traverse through. > Both a link and tunnel may have multiple hops not visible to IP, each of which may have a different MTU; this is no different than an IP path MTU. The difference is that the link/tunnel hops are not visible to IP. > > > In the section 1 of your draft, you stated: “.. tunnels emulate a > link”. To me, “tunnel” hide the inner addresses, but the packets can > traverse many links. So Tunnels hardly emulate a link. > There are many link layer technologies which use multiple link-layer hops and relaying, including Ethernet, ATM, SONET, etc. Joe
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