A fix is available
APAR status
Closed as program error.
Error description
Default ISNO option values are used when configuring an interface via ifconfig. These can be changed with the ifconfig command at any time. However, those option values that have been set before are not preserved on subsequent configuration calls to ifconfig. For example, # ifconfig en3 en3: flags=1e080863,c0<UP,BROADCAST,NOTRAILERS,RUNNING,SIMPLEX,MULTIC AST,GROUPRT,64BIT,CHECKSUM_OFFLOAD(ACTIVE),LARGESEND,CHAIN> inet 192.1.3.2 netmask 0xffffff00 broadcast 192.1.3.255 tcp_sendspace 131072 tcp_recvspace 65536 rfc1323 1 # ifconfig en3 tcp_recvspace 262144 # ifconfig en3 en3: flags=1e080863,c0<UP,BROADCAST,NOTRAILERS,RUNNING,SIMPLEX,MULTIC AST,GROUPRT,64BIT,CHECKSUM_OFFLOAD(ACTIVE),LARGESEND,CHAIN> inet 192.1.3.2 netmask 0xffffff00 broadcast 192.1.3.255 tcp_sendspace 131072 tcp_recvspace 262144 rfc1323 1 # ifconfig en3 tcp_sendspace 262144 # ifconfig en3 en3: flags=1e080863,c0<UP,BROADCAST,NOTRAILERS,RUNNING,SIMPLEX,MULTIC inet 192.1.3.2 netmask 0xffffff00 broadcast 192.1.3.255 tcp_sendspace 262144 tcp_recvspace 65536 rfc1323 1 In the last command we see tcp_recvspace went to its default value.
Local fix
Problem summary
Default ISNO option values are used when configuring an interface via ifconfig. These can be changed with the ifconfig command at any time. However, those option values that have been set before are not preserved on subsequent configuration calls to ifconfig. For example, # ifconfig en3 en3: flags=1e080863,c0<UP,BROADCAST,NOTRAILERS,RUNNING,SIMPLEX,MULTIC AST,GROUPRT,64BIT,CHECKSUM_OFFLOAD(ACTIVE),LARGESEND,CHAIN> inet 192.1.3.2 netmask 0xffffff00 broadcast 192.1.3.255 tcp_sendspace 131072 tcp_recvspace 65536 rfc1323 1 # ifconfig en3 tcp_recvspace 262144 # ifconfig en3 en3: flags=1e080863,c0<UP,BROADCAST,NOTRAILERS,RUNNING,SIMPLEX,MULTIC AST,GROUPRT,64BIT,CHECKSUM_OFFLOAD(ACTIVE),LARGESEND,CHAIN> inet 192.1.3.2 netmask 0xffffff00 broadcast 192.1.3.255 tcp_sendspace 131072 tcp_recvspace 262144 rfc1323 1 # ifconfig en3 tcp_sendspace 262144 # ifconfig en3 en3: flags=1e080863,c0<UP,BROADCAST,NOTRAILERS,RUNNING,SIMPLEX,MULTIC inet 192.1.3.2 netmask 0xffffff00 broadcast 192.1.3.255 tcp_sendspace 262144 tcp_recvspace 65536 rfc1323 1 In the last command we see tcp_recvspace went to its default value.
Problem conclusion
Preserve the values stored in the kernel instead of overwriting them with the adapter's default values.
Temporary fix
Comments
APAR Information
APAR number
IV03561
Reported component name
AIX V7.1
Reported component ID
5765H4000
Reported release
710
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Submitted date
2011-07-20
Closed date
2011-07-20
Last modified date
2013-04-16
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
Fix information
Fixed component name
AIX V7.1
Fixed component ID
5765H4000
Applicable component levels
R710 PSY U838091
UP11/10/05 I 1000
PTF to Fileset Mapping
U838091 bos.net.tcp.client 7.1.1.0
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Document Information
Modified date:
16 April 2013