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OHSU has similar constraints. A few miscellaneous host-oriented tests were also performed using Cisco IOS, Linux redhat, and Solaris. PSU at least, has aggregation capabilities in that regard. FreeBSD was on the order of 3-5 microseconds per call. By 1994, local area networks (LANs) were well established to provide data communication in buildings and offices. We did not pursue finding out why linux performance was inferior as well as peculiar (it did not respond to window-size changes). 64 bytes from jerry.cat.pdx.edu (131.252.208.14): icmp_seq=0 ttl=254 time=0.3 ms 64 bytes from jerry.cat.pdx.edu (131.252.208.14):Here we at least admit that the roundtrip time was on the order of .3 milliseconds, but granularity is no better than a tenth of a millisecond. Readers may make of this what they will.We believe we met our goals in this study. Imposing even simple security mechanisms like ACL-based ingress/egress filters may have serious impacts on speed. 2.
What might we learn from this table?For one thing, short-haul gigabit TCP seems to be sensitive to delay. We will return to the ping issue more below. It covers a large geographical area and may serve as an ISP (Internet Service Provider). Dr. Corbato stated that his basic rule was that all ACLs must be off. In the middle part of the paper, we present various test results, including section 3, calibration tests, section 4, backbone tests, section 5, MAN tests, and section 6, "things that go bump in the night". If we add even a single small switch, we have lost 40% of our initial throughput potential. All the network engineers in the PREN community were interested in seeing what we could learn about our various pieces of Cisco network gear, including various Cisco routers, with a central Cisco GSR 12000 router and border routers like the Cisco 7506. With 64k windows, we get 434 mbits, so we gained approximately 60mbits throughput.
One other way to look at this is that with no switch, we basically have a 4 to 1 ratio between the number of packets sent at 56 bytes and the number of 1460 byte packets. This is due to a security problem and other extra configuration.MAN cannot work on traditional phone copper wires. All cards have SX fiber connectors. This can make your connection appear faster than it really is. They want you to think your connection is running perfectly... but is it really?Other speed tests, especially tests offered by your Internet provider try to eliminate routing factors. In some cases, for so-called "calibration" tests, we performed the test over localhost on one host, or performed a "null switch" test over a single fiber pair between two directly connected hosts. Flood ping allows us to send a great number of packets in a very short time as this ping variation sends as many pings as possible with no per ping delay. [Miller97] suggests 6% overhead for SONET. Jim Binkley - Computer Science, Portland State University jrb@cs.pdx.edu Don Westlight - Information Technology, Oregon Graduate Institute don@admin.ogi.edu. In the last column, we show layer 2 and layer 3 transitions in the test. Please refer to the following tables and figures including figure CPING1 (given in the previous section), which includes both single and double switch ping data, and figure IPLOT, which includes ttcp data for these two tests and also for reference, includes the 3 previous single switch tests.Regarding ping delays (please look at figure CPING1), there is further evidence here that the Catalyst 5500 switch is closer to the ideal of no switch. Some pings do not have flood ping capabilities; for example, both WNT and Solaris pings lack that capability. ).As an adventure in speculation, please consider the following table taken from some of the previous tests:Here we attempt to cross-correlate some results from all of the major test sections. Localhost on the other hand has a much better ratio, roughly 2 to 1. Both campus backbones are roughly similar with two or more Cisco Catalyst 5500 switch/routers with RSM (route switch module) router cards in the center, and typical outlying smaller switches (although sometimes the outlying switches are not smaller and may be larger switches as well). BSD ping (and the latest linux ping) is far superior to other pings.5. We also had forgotten that a complex Access Control List (ACL) was deployed in the router to protect the rest of PSU from any problems in the networking lab. Metropolitan Area Network combines local networks located within a city, and is based on high data rate compounds, implemented on the basis of fiber channels and other digital data transmission channels.
OHSU has similar constraints. A few miscellaneous host-oriented tests were also performed using Cisco IOS, Linux redhat, and Solaris. PSU at least, has aggregation capabilities in that regard. FreeBSD was on the order of 3-5 microseconds per call. By 1994, local area networks (LANs) were well established to provide data communication in buildings and offices. We did not pursue finding out why linux performance was inferior as well as peculiar (it did not respond to window-size changes). 64 bytes from jerry.cat.pdx.edu (131.252.208.14): icmp_seq=0 ttl=254 time=0.3 ms 64 bytes from jerry.cat.pdx.edu (131.252.208.14):Here we at least admit that the roundtrip time was on the order of .3 milliseconds, but granularity is no better than a tenth of a millisecond. Readers may make of this what they will.We believe we met our goals in this study. Imposing even simple security mechanisms like ACL-based ingress/egress filters may have serious impacts on speed. 2.
What might we learn from this table?For one thing, short-haul gigabit TCP seems to be sensitive to delay. We will return to the ping issue more below. It covers a large geographical area and may serve as an ISP (Internet Service Provider). Dr. Corbato stated that his basic rule was that all ACLs must be off. In the middle part of the paper, we present various test results, including section 3, calibration tests, section 4, backbone tests, section 5, MAN tests, and section 6, "things that go bump in the night". If we add even a single small switch, we have lost 40% of our initial throughput potential. All the network engineers in the PREN community were interested in seeing what we could learn about our various pieces of Cisco network gear, including various Cisco routers, with a central Cisco GSR 12000 router and border routers like the Cisco 7506. With 64k windows, we get 434 mbits, so we gained approximately 60mbits throughput.
One other way to look at this is that with no switch, we basically have a 4 to 1 ratio between the number of packets sent at 56 bytes and the number of 1460 byte packets. This is due to a security problem and other extra configuration.MAN cannot work on traditional phone copper wires. All cards have SX fiber connectors. This can make your connection appear faster than it really is. They want you to think your connection is running perfectly... but is it really?Other speed tests, especially tests offered by your Internet provider try to eliminate routing factors. In some cases, for so-called "calibration" tests, we performed the test over localhost on one host, or performed a "null switch" test over a single fiber pair between two directly connected hosts. Flood ping allows us to send a great number of packets in a very short time as this ping variation sends as many pings as possible with no per ping delay. [Miller97] suggests 6% overhead for SONET. Jim Binkley - Computer Science, Portland State University jrb@cs.pdx.edu Don Westlight - Information Technology, Oregon Graduate Institute don@admin.ogi.edu. In the last column, we show layer 2 and layer 3 transitions in the test. Please refer to the following tables and figures including figure CPING1 (given in the previous section), which includes both single and double switch ping data, and figure IPLOT, which includes ttcp data for these two tests and also for reference, includes the 3 previous single switch tests.Regarding ping delays (please look at figure CPING1), there is further evidence here that the Catalyst 5500 switch is closer to the ideal of no switch. Some pings do not have flood ping capabilities; for example, both WNT and Solaris pings lack that capability. ).As an adventure in speculation, please consider the following table taken from some of the previous tests:Here we attempt to cross-correlate some results from all of the major test sections. Localhost on the other hand has a much better ratio, roughly 2 to 1. Both campus backbones are roughly similar with two or more Cisco Catalyst 5500 switch/routers with RSM (route switch module) router cards in the center, and typical outlying smaller switches (although sometimes the outlying switches are not smaller and may be larger switches as well). BSD ping (and the latest linux ping) is far superior to other pings.5. We also had forgotten that a complex Access Control List (ACL) was deployed in the router to protect the rest of PSU from any problems in the networking lab. Metropolitan Area Network combines local networks located within a city, and is based on high data rate compounds, implemented on the basis of fiber channels and other digital data transmission channels.