[KLUG Members] Any thoughts on network(WAN) problem?

[David Hamilton]

Do you have the same telnet issues from the nortel router to nortel router?  From first router to switch?  From second router to switch? From local site to switch? From local site to first router? etc...



Adam Tauno Williams extolled:
> Configuration A:
> <HUB>---<Cisco 2511>---64k PtP---
> ---<Cisco 2511>---<Switch>
> 
> Configuration B:
> <HUB>---<Notel BCM>----1.54Mb Frame---
> ---<Nortel Passport 2430>---<Switch>
> 
> Both A & B are between the same two sites,  the HUB is at the remote site and
> the switch is at the "host" site.  Both A & B use OSPF routing protocol,  so if
> I take down B,  routing tables automatically update to circuit A.  On the switch
> end are RS/6000 AIX 4.2.1, Redhat Linux 7.0 and 7.1 servers, a Linux based
> firewall, and a Citrix Winframe server (NT 3.51).  Both ends have Linux and
> Microsoft clients (Win9x and WinY2k, no WinNT).  
> 
> The remote site has been running on circuit A for ***years*** with no problems
> what so ever with roughly the same client mix.  Remote site uses HTTP, HTTPs,
> LDAP, LPD, TELNET, SSH, SMB/CIFS, WINS, ICA, DNS, and NFS/NIS (portmap) provided
> at the host site.  While slow circuit A is 99.999% reliable.
> 
> Bringing up circuit B (by doing an admin shutdown of A at the router port),  the
> routing tables propogate, etc... Connectivity is virutally uninterrupeted. 
> However on circuit B, while users can telnet and login from WinXX clients and
> NIS clients basically no other protocol is operational.  HTTP requests receive
> the initial ACK and no subsequent data,  SMB connections time out (resource no
> longer available).  And while telnet works it infrequently freezes during screan
> repaints,  and never resumes.  The RS/6000 (as a host) seems to fair somewhat
> better than either the Winframe server or the Linux hosts,  but connectivity is
> still a little spotty.  With the Citrix Winframe server enough traffic passes to
> display the window, but no contents,  and the connection times out
> (eventually).  SSH connections suffer the same problem as telnet,  freezing up
> when burst of data come down.  
> 
> However pinging and traceroute (ICMP) claims that circuit B is near perfect
> (1~2% packet loss,  which could just be packets lost when the ping command is
> canceled).  I have done a ping with various payload sized (default, 512, 768,
> 1028, 1124) and all return near perfect, even when run for over an hour.  Ping
> floods (send as fast as yout can) also almost all return,  or as many as you
> would expect to survive over a bandwidth constrained circuit.
> 
> I have captured (with ethereal) traffic on both subnets and don't see anything
> unusual,  packets just seem to "get lost".
> 
> Any thoughts or suggestions would be appreciated.
> 
> Systems and Network Administrator
> Morrison Industries
> 1825 Monroe Ave NW
> Grand Rapids, MI. 49505
> _______________________________________________
> Members mailing list
> Members@kalamazoolinux.org
> 

-- 
David Hamilton
David.Hamilton@Voyager.net