| Title: | DEC TCP/IP Services for OpenVMS |
| Notice: | Note 2-SSB Kits, 3-FT Kits, 4-Patch Info, 7-QAR System |
| Moderator: | ucxaxp.ucx.lkg.dec.com::TIBBERT |
| Created: | Thu Nov 17 1994 |
| Last Modified: | Fri Jun 06 1997 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 5568 |
| Total number of notes: | 21492 |
Hello,
Question about communication proxies. My customer has a multihomed host
define in DNS/BIND. Something like:
ahatje in a 123.123.123.123
in a 23.23.23.23
On another system he adds the following proxy:
UCX> add prox knoppers/remote=aha/host=ahatje
The remote host (ahatje) is not in the locat host file. Now when you give
'show proxy' commands you see the following:
UCX> sho prox
VMS User_name Type User_ID Group_ID Host_name
KNOPPERS C AHA AHATJE
UCX> sho prox
VMS User_name Type User_ID Group_ID Host_name
KNOPPERS CD AHA AHATJE
UCX> sho prox
VMS User_name Type User_ID Group_ID Host_name
KNOPPERS C AHA AHATJE
UCX>
[etc]
I.e. the proxy only works half of the time. As far as I can see the only
workaround is to add the proxy as two proxies, for instance with the two IP
addresses.
Is this intended? Should the 'add proxy' command not add proxies for all
addresses returned by the name lookup?
Thanks,
Oswald
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 5214.1 | DNS load balancing ? | BACHUS::ROELANDTS | Wa d'es ma da ve ne stuut | Tue Feb 11 1997 06:27 | 10 |
Oswald,
What shows up when you do in UCX a : show host/nolocal ahatje ? Do you
get alternatively the 1st then the 2d IP-address ? Could it be that the
system is using the Round Robin DNS load balancing ?
Rgds
Guy
| |||||
| 5214.2 | yes, dns does do round robin | UTRTSC::KNOPPERS | Oswald Knoppers | Tue Feb 11 1997 09:33 | 13 |
Yes, sorry I forgot to include that info. Yes the server is doing round robin and obviously this is the source of the problem. Apparently when you create the proxy, the dns server is queried, and the first returned address is actually used in the proxy. Then each time a 'show proxy' again queries the server and half of the times the same address is returned first. Any thoughts? Regards, Oswald | |||||
| 5214.3 | do you need it ? | BACHUS::ROELANDTS | Wa d'es ma da ve ne stuut | Tue Feb 11 1997 10:07 | 15 |
Oswald,
Do you need the Round Robin functionality ? Otherwise there is a
logical that you can define to stop it : it is the logical
UCX$BIND_ROUND_ROBIN_OFF
Note 5145 in this conference talks a bit about it.
Rgds,
Guy
| |||||
| 5214.4 | a bug is an undocumented feature :-) | UTRTSC::KNOPPERS | Oswald Knoppers | Tue Feb 11 1997 10:14 | 8 |
I don't think in this case the server is UCX based. Current workaround is to add two proxies for the two different IP addresses. Obviously not very elegant. Therefore this question. Is this behaviour a) expected b) bug or c) limitation... Thanks, Oswald | |||||