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Full Discussion: bandwidth check?
Top Forums UNIX for Dummies Questions & Answers bandwidth check? Post 14442 by Neo on Thursday 31st of January 2002 04:21:50 PM
Old 01-31-2002
Your question is interesting but a little ambiguous:
  • Do you want to verify the size of a circuit that you use alone?
  • Or, is the T1 shared with others?
  • Do you want to see if you get T1 throughput across the ISP to the backbone (differnet question)?
  • Do you want to see if congestion is such that you actuall get T1 speeds and where?

Remember that you are using IP.... .and TCP/IP tools can only verify TCP/IP related parameters..... a T1 congested with loads of IP traffic can perform like a 28 KB modem, right? So, TCP/IP tools have only limited value when discussing circuits and other wire-speed parameters.

The broader anwer to you question is that MANY people pay for T1 ISP connections but for many reasons cannot get the benefits of T1 because of:
  • How their ISP is configured?
  • How circuits and router ports are shared.
  • The underlying transport of the T1 (frame relay, ATM, etc.)
  • Poor ISP connections to the big I backbone.
  • Oversold pipes and ports by ISP (congestion problems).
  • Firewalls and proxy services slowing down the link.
  • etc. etc. etc.

As you might guess, it is necessary to be very configuration and topologically specific when discussing network performance issues......
 

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FAITH(4)						   BSD Kernel Interfaces Manual 						  FAITH(4)

NAME
faith -- IPv6-to-IPv4 TCP relay capturing interface SYNOPSIS
device faith DESCRIPTION
The faith interface captures IPv6 TCP traffic, for implementing userland IPv6-to-IPv4 TCP relay like faithd(8). Each faith interface is created at runtime using interface cloning. This is most easily done with the ifconfig(8) create command or using the cloned_interfaces variable in rc.conf(5). Special action will be taken when IPv6 TCP traffic is seen on a router, and the routing table suggests to route it to the faith interface. In this case, the packet will be accepted by the router, regardless of the list of IPv6 interface addresses assigned to the router. The packet will be captured by an IPv6 TCP socket, if it has the IN6P_FAITH flag turned on and matching address/port pairs. As a result, faith will let you capture IPv6 TCP traffic to some specific destination addresses. Userland programs, such as faithd(8) can use this behavior to relay IPv6 TCP traffic to IPv4 TCP traffic. The program can accept some specific IPv6 TCP traffic, perform getsockname(2) to get the IPv6 destination address specified by the client, and perform application-specific address mapping to relay IPv6 TCP to IPv4 TCP. The IN6P_FAITH flag on a IPv6 TCP socket can be set by using setsockopt(2), with level IPPROTO_IPV6 and optname IPv6_FAITH. To handle error reports by ICMPv6, some ICMPv6 packets routed to an faith interface will be delivered to IPv6 TCP, as well. To understand how faith can be used, take a look at the source code of faithd(8). As the faith interface implements potentially dangerous operations, great care must be taken when configuring it. To avoid possible misuse, the sysctl(8) variable net.inet6.ip6.keepfaith must be set to 1 prior to using the interface. When net.inet6.ip6.keepfaith is 0, no packets will be captured by the faith interface. The faith interface is intended to be used on routers, not on hosts. SEE ALSO
inet(4), inet6(4), faithd(8) Jun-ichiro itojun Hagino and Kazu Yamamoto, An IPv6-to-IPv4 transport relay translator, RFC3142. HISTORY
The FAITH IPv6-to-IPv4 TCP relay translator first appeared in the WIDE hydrangea IPv6 stack. BSD
April 10, 1999 BSD

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