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[Veritas-bu] Very ODD problem with NB5.1MP3a + 2 Solaris Clients

2005-11-08 12:16:05
Subject: [Veritas-bu] Very ODD problem with NB5.1MP3a + 2 Solaris Clients
From: pkeating AT bank-banque-canada DOT ca (Paul Keating)
Date: Tue, 8 Nov 2005 12:16:05 -0500 
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Ummm....are any of your systems multi homed?
=20
looks like an asymmetrical routing issue we had here recently.
=20
backup server talks to client on NIC A, but client replies back to
server from NIC B via an alternate path.
=20
the ARP table on your switch that the backup server and NIC A are
connected to doesn't get populated with the MAC of the client NIC A
untill the client ARPs or tries to talk to via NIC A....then
communication works for 5-10 minutes or untill your ARP cache refreshes,
then communication is broken till the client tries to talk to the server
again.
=20
I'm thinking it's likely not an issue if your clients all are single NIC
or connected to a single switch along with the backup server.
=20
check with your network guys to see if they're seeing any broadcasting
on the switches your backup server and clients are attached to.
=20
Paul

        -----Original Message-----
        From: veritas-bu-admin AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu] On Behalf Of Piszcz,
Justin
        Sent: November 8, 2005 11:59 AM
        To: Piszcz, Justin; Patrick Whelan
        Cc: veritas-bu AT mailman.eng.auburn DOT edu
        Subject: RE: [Veritas-bu] Very ODD problem with NB5.1MP3a + 2
Solaris Clients
=09
=09

        Name resolution is setup through /etc/hosts on the backup
server, no external DNS servers are used.

        The subnet is the same yes.

        The bp.conf is the same for the most part, the error occurs on
both systems.

        =20

        MASTER -> CLIENTS:

        jpiszcz@backup01# telnet 172.16.0.135 bpcd

        Trying 172.16.0.135...

        ^C

        jpiszcz@backup01# telnet 172.16.0.136 bpcd

        Trying 172.16.0.136...

        =20

        HANGs and HANGs..-How would I debug this problem?

        =20

        CLIENTS -> MASTER

        box1# telnet backup01 bpcd

        Trying 172.16.0.2...

        Connected to backup01.

        Escape character is '^]'.

        =20

        box2# telnet backup01 bpcd

        Trying 172.16.0.2...

        Connected to backup01.

        Escape character is '^]'.

        =20

        Now the EXTREMELY WEIRD PART!!! (now I can MASTER->CLIENTS) - NO
ISSUE

        jpiszcz@backup01# telnet 172.16.0.135 bpcd

        Trying 172.16.0.135...

        Connected to 172.16.0.135.

        Escape character is '^]'.

        ^]

        telnet> Connection to 172.16.0.135 closed.

        jpiszcz@backup01# telnet 172.16.0.136 bpcd

        Trying 172.16.0.136...

        Connected to 172.16.0.136.

        Escape character is '^]'.

        =20

        Any freaking clue what is going on here?

        =20


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<BODY lang=3DEN-US vLink=3Dpurple link=3Dblue>
<DIV><SPAN class=3D578470517-08112005><FONT face=3DArial color=3D#800000 =

size=3D2>Ummm....are any of your systems multi =
homed?</FONT></SPAN></DIV>
<DIV><SPAN class=3D578470517-08112005><FONT face=3DArial color=3D#800000 =

size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=3D578470517-08112005><FONT face=3DArial color=3D#800000 =
size=3D2>looks=20
like an asymmetrical routing issue we had here =
recently.</FONT></SPAN></DIV>
<DIV><SPAN class=3D578470517-08112005><FONT face=3DArial color=3D#800000 =

size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=3D578470517-08112005><FONT face=3DArial color=3D#800000 =
size=3D2>backup=20
server talks to client on NIC A, but client replies back to server from =
NIC B=20
via an alternate path.</FONT></SPAN></DIV>
<DIV><SPAN class=3D578470517-08112005><FONT face=3DArial color=3D#800000 =

size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=3D578470517-08112005><FONT face=3DArial color=3D#800000 =
size=3D2>the=20
ARP table on your switch that the backup server and NIC A&nbsp;are =
connected to=20
doesn't get populated with the MAC of the&nbsp;client NIC A untill the =
client=20
ARPs or&nbsp;tries to talk to via NIC A....then communication works for =
5-10=20
minutes or untill your ARP cache refreshes, then communication is broken =
till=20
the client tries to talk to the server again.</FONT></SPAN></DIV>
<DIV><SPAN class=3D578470517-08112005><FONT face=3DArial color=3D#800000 =

size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=3D578470517-08112005><FONT face=3DArial color=3D#800000 =
size=3D2>I'm=20
thinking it's likely not an issue if your clients all are single NIC or=20
connected to a single switch along with the backup =
server.</FONT></SPAN></DIV>
<DIV><SPAN class=3D578470517-08112005><FONT face=3DArial color=3D#800000 =

size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=3D578470517-08112005><FONT face=3DArial color=3D#800000 =
size=3D2>check=20
with your network guys to see if they're seeing any broadcasting on the =
switches=20
your backup server and clients are attached to.</FONT></SPAN></DIV>
<DIV><SPAN class=3D578470517-08112005><FONT face=3DArial color=3D#800000 =

size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=3D578470517-08112005><FONT face=3DArial color=3D#800000 =

size=3D2>Paul</FONT></SPAN></DIV>
<BLOCKQUOTE dir=3Dltr=20
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #800000 2px =
solid; MARGIN-RIGHT: 0px">
  <DIV></DIV>
  <DIV class=3DOutlookMessageHeader lang=3Den-us dir=3Dltr =
align=3Dleft><FONT=20
  face=3DTahoma size=3D2>-----Original Message-----<BR><B>From:</B>=20
  veritas-bu-admin AT mailman.eng.auburn DOT edu=20
  [mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu] <B>On Behalf Of =
</B>Piszcz,=20
  Justin<BR><B>Sent:</B> November 8, 2005 11:59 AM<BR><B>To:</B> Piszcz, =
Justin;=20
  Patrick Whelan<BR><B>Cc:</B>=20
  veritas-bu AT mailman.eng.auburn DOT edu<BR><B>Subject:</B> RE: [Veritas-bu] =
Very ODD=20
  problem with NB5.1MP3a + 2 Solaris Clients<BR><BR></FONT></DIV>
  <DIV class=3DSection1>
  <P class=3DMsoNormal><FONT face=3DArial color=3Dnavy size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Name =
resolution is=20
  setup through /etc/hosts on the backup server, no external DNS servers =
are=20
  used.<o:p></o:p></SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial color=3Dnavy size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">The subnet =
is the=20
  same yes.<o:p></o:p></SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial color=3Dnavy size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">The bp.conf =
is the=20
  same for the most part, the error occurs on both=20
  systems.<o:p></o:p></SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial color=3Dnavy size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: =
Arial"><o:p>&nbsp;</o:p></SPAN></FONT></P>
  <DIV=20
  style=3D"BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: =
medium none; PADDING-LEFT: 0in; PADDING-BOTTOM: 1pt; BORDER-LEFT: medium =
none; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 1pt solid">
  <P class=3DMsoNormal><FONT face=3DArial color=3Dnavy size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">MASTER =
-&gt;=20
  CLIENTS:<o:p></o:p></SPAN></FONT></P></DIV>
  <P class=3DMsoNormal><FONT face=3DArial color=3Dnavy size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: =
Arial">jpiszcz@backup01#=20
  telnet 172.16.0.135 bpcd<o:p></o:p></SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial color=3Dnavy size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Trying=20
  172.16.0.135...<o:p></o:p></SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial color=3Dnavy size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: =
Arial">^C<o:p></o:p></SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial color=3Dnavy size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: =
Arial">jpiszcz@backup01#=20
  telnet 172.16.0.136 bpcd<o:p></o:p></SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial color=3Dnavy size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Trying=20
  172.16.0.136...<o:p></o:p></SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial color=3Dnavy size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: =
Arial"><o:p>&nbsp;</o:p></SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial color=3Dnavy size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">HANGs and =
HANGs..&#8212;How=20
  would I debug this problem?<o:p></o:p></SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial color=3Dnavy size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: =
Arial"><o:p>&nbsp;</o:p></SPAN></FONT></P>
  <DIV=20
  style=3D"BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: =
medium none; PADDING-LEFT: 0in; PADDING-BOTTOM: 1pt; BORDER-LEFT: medium =
none; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 1pt solid">
  <P class=3DMsoNormal><FONT face=3DArial color=3Dnavy size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">CLIENTS =
-&gt;=20
  MASTER<o:p></o:p></SPAN></FONT></P></DIV>
  <P class=3DMsoNormal><FONT face=3DArial color=3Dnavy size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">box1# =
telnet backup01=20
  bpcd<o:p></o:p></SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial color=3Dnavy size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Trying=20
  172.16.0.2...<o:p></o:p></SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial color=3Dnavy size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Connected =
to=20
  backup01.<o:p></o:p></SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial color=3Dnavy size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Escape =
character is=20
  '^]'.<o:p></o:p></SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial color=3Dnavy size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: =
Arial"><o:p>&nbsp;</o:p></SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial color=3Dnavy size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">box2# =
telnet backup01=20
  bpcd<o:p></o:p></SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial color=3Dnavy size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Trying=20
  172.16.0.2...<o:p></o:p></SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial color=3Dnavy size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Connected =
to=20
  backup01.<o:p></o:p></SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial color=3Dnavy size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Escape =
character is=20
  '^]'.<o:p></o:p></SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial color=3Dnavy size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: =
Arial"><o:p>&nbsp;</o:p></SPAN></FONT></P>
  <DIV=20
  style=3D"BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: =
medium none; PADDING-LEFT: 0in; PADDING-BOTTOM: 1pt; BORDER-LEFT: medium =
none; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 1pt solid">
  <P class=3DMsoNormal><FONT face=3DArial color=3Dnavy size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Now the =
EXTREMELY=20
  WEIRD PART!!! (now I can MASTER-&gt;CLIENTS) &#8211; NO=20
  ISSUE<o:p></o:p></SPAN></FONT></P></DIV>
  <P class=3DMsoNormal><FONT face=3DArial color=3Dnavy size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: =
Arial">jpiszcz@backup01#=20
  telnet 172.16.0.135 bpcd<o:p></o:p></SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial color=3Dnavy size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Trying=20
  172.16.0.135...<o:p></o:p></SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial color=3Dnavy size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Connected =
to=20
  172.16.0.135.<o:p></o:p></SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial color=3Dnavy size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Escape =
character is=20
  '^]'.<o:p></o:p></SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial color=3Dnavy size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: =
Arial">^]<o:p></o:p></SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial color=3Dnavy size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">telnet&gt; =
Connection=20
  to 172.16.0.135 closed.<o:p></o:p></SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial color=3Dnavy size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: =
Arial">jpiszcz@backup01#=20
  telnet 172.16.0.136 bpcd<o:p></o:p></SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial color=3Dnavy size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Trying=20
  172.16.0.136...<o:p></o:p></SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial color=3Dnavy size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Connected =
to=20
  172.16.0.136.<o:p></o:p></SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial color=3Dnavy size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Escape =
character is=20
  '^]'.<o:p></o:p></SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial color=3Dnavy size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: =
Arial"><o:p>&nbsp;</o:p></SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial color=3Dnavy size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Any =
freaking clue=20
  what is going on here?<o:p></o:p></SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3D"Times New Roman" size=3D3><SPAN=20
  style=3D"FONT-SIZE: =
12pt"><o:p>&nbsp;</o:p></SPAN></FONT></P></DIV></BLOCKQUOTE></BODY></HTML=
>
=00
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