CHGTCPA question

When prompting the CHGTCPA at a client the following screen values are 
displayed:

        Change TCP/IP Attributes (CHGTCPA)

1)  TCP keep alive              120
2)  TCP urgent pointer          *BSD
3)  TCP receive buffer size     8192
4)  TCP send buffer size        8192
5)  UDP checksum                *YES
6)  IP datagram forwarding      *YES
7)  IP source routing           *YES
8)  IP reassembly time-out      120
9)  IP time to live             64
10) ARP cache timeout           5
11) Log protocol errors *YES

I would like an analysis from a performance standpoint.  I'm not sure what 
effect changes to most of these values would have.

I think 1 & 2 can be left alone.
3 & 4 seems a little high.  I suspect that they are seeing noticeable 
degradation when there are line errors.
Can 5 - 7 safely be changed to *NO?  Would it help performance?
What are 8 - 10?
11 is OK.  Actually, does this need to be checked in SST?

  TIA.

  -mark
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