I agree.. make sure you have R1 and R2's connecting interfaces both set to manual 100FD because it can't go any higher anyway. That is a mismatch. Not sure if that is THE problem but it is definitely A problem.
----- Original Message ----- From: "George Skorup" <geo...@cbcast.com> To: "af" <af@afmug.com> Sent: Wednesday, October 26, 2016 5:24:07 PM Subject: Re: [AFMUG] Trouble Identifying Throughput Issue The manual 100FD interface... what is that talking to? The Auto 1G on R1? If that's the case, I'd bet that's your problem. Keep in mind that you cannot run auto on one side and fixed FDX on the other side. This results in a duplex mismatch. The interface in auto will fall back to HDX. If you did auto one side and HDX on the other side, they'd both be HDX, so it would work fine. But obviously half duplex sux. On 10/26/2016 1:54 PM, Christopher Gray wrote: > R1 is the only router with 1 Gbps ports. Everything is auto except 1 > connection that requires manual settings. > > *R1* -- (Auto 1 G FD) ...Internet... (Manual 100 FD) -- *R2 *-- (Auto > 100 FD) -- *R3* -- (Auto 100 FD) ...M5... (Auto 100 FD) -- *R4* > > MTU is set to 1500 on every port (and the UBNT link). > > Flow control is off, and none of the interfaces show any pause frames > received. > > > This is a live link, but it is only running ~ 1 Mbps otherwise. > > > > On Wed, Oct 26, 2016 at 2:12 PM, Steve <li...@wavedirect.org > <mailto:li...@wavedirect.org>> wrote: > > Few questions come to mind. > > Are all set to auto negotiate or are they fixed at 100Mbit? > What are the MTU's of each connection? > Flow control turned on? > > > ----- Original Message ----- > From: "Christopher Gray" <cg...@graytechsoftware.com > <mailto:cg...@graytechsoftware.com>> > To: "af" <af@afmug.com <mailto:af@afmug.com>> > Sent: Wednesday, October 26, 2016 1:57:56 PM > Subject: [AFMUG] Trouble Identifying Throughput Issue > > I have a section of my network that is lacking something, and I can't > figure out where the problem is. I'm looking for any thoughts / > suggestions. > > 4x MikroTik routers > > Link speeds: > R1 -- (30 Mbps IP / Transport) -- R2 -- (100 Mbps Eth) -- R3 -- > (75 Mbps > UBNT M5) -- R4 > > The limiting factor for traffic should be the Transport, and I > expect to be > able to get 30 Mbps across the system (one-way). > > Testing from R1 to R3 runs 30 Mbps. > > Testing from R2 to R4 runs 75 Mbps. > > Testing from R1 to R4 only runs 10 Mbps (instead of 30). > > Tests were one-way btest with 20 TCP streams. > > Any ideas for something that would cause this? > >
