You cannot increase the MTU for ethernet larger than 1500 bytes because 802.3 (the standard for ethernet) does not allow that.
You may see issues. The problem is that both 3745 does not know the existance of the ethernet. If either 3745 sends a packet larger than 1500 bytes, the 2613 will drop the packet. (I am not an expert on 2210, I do not know if the 2210 is smart enough to segment the SNA packet into 2. I doubt it does, but please confirm it with IBM.) This causes the remote FEP detects a gap in SDLC, LLC2, or TH sequence number. No matter which layer detects the problem. The end result is still the same. The DLSw circuit will be disconnected.
There are several suggestions to your problem:
1. Make sure the both FEP will not send any PIU larger than 1500 bytes. This can be done either on the NCP gen or modtab. Checking the modtab is tough because your system programmers have to know all application running over the link. Then, they have to check the corresponding modtab entry for the applications.
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