Ingress filtering on edge routers and performance concernsUnderstanding ARP and RoutersLearning switches and routersAccess list policy with odd and even filteringCommunication between BGP and OSPF routersCisco routers THROUGHPUT - MTU and packet sizeWhat are the significance of different types of routers?Routers and RIP violation of isolation?Some users/routers often can't access the internetWhether the network between Routers are circuit-switched network, and the network connected by Switches are packet-switched network?What's the meaning of “3D Universal Edge Routers”?
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Ingress filtering on edge routers and performance concerns
Understanding ARP and RoutersLearning switches and routersAccess list policy with odd and even filteringCommunication between BGP and OSPF routersCisco routers THROUGHPUT - MTU and packet sizeWhat are the significance of different types of routers?Routers and RIP violation of isolation?Some users/routers often can't access the internetWhether the network between Routers are circuit-switched network, and the network connected by Switches are packet-switched network?What's the meaning of “3D Universal Edge Routers”?
The RFC 4778 cover the Operational Security Practices in ISPs Environments back on 2007.
Among the best practices, a common one is Ingress Filtering on edge routers. In the above RFC, the author says the following:
Lack of consistency regarding the ability to filter, especially with
respect to performance issues, cause some ISPs not to implement BCP38
and BCP84 guidelines for ingress filtering. One such example is at
edge boxes, where up to 1000 T1s connecting into a router with an
OC-12 (Optical Carrier) uplink. Some deployed devices experience a
large performance impact with filtering, which is unacceptable for
passing customer traffic through, though ingress filtering (uRPF)
might be applicable at the devices that are connecting these
aggregation routers. Where performance is not an issue, the ISPs
make a tradeoff between management versus risk.
Is the impact on performance nowadays a concern among network operators to not deploy ingress filtering on their networks? Is there anything else to worry about? Can you provide some kind of evidence to support your argument?
Thank you all for the answers.
router network
asked 8 hours ago
DigosDigos
133
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The RFC 4778 cover the Operational Security Practices in ISPs Environments back on 2007.
Among the best practices, a common one is Ingress Filtering on edge routers. In the above RFC, the author says the following:
Lack of consistency regarding the ability to filter, especially with
respect to performance issues, cause some ISPs not to implement BCP38
and BCP84 guidelines for ingress filtering. One such example is at
edge boxes, where up to 1000 T1s connecting into a router with an
OC-12 (Optical Carrier) uplink. Some deployed devices experience a
large performance impact with filtering, which is unacceptable for
passing customer traffic through, though ingress filtering (uRPF)
might be applicable at the devices that are connecting these
aggregation routers. Where performance is not an issue, the ISPs
make a tradeoff between management versus risk.
Is the impact on performance nowadays a concern among network operators to not deploy ingress filtering on their networks? Is there anything else to worry about? Can you provide some kind of evidence to support your argument?
Thank you all for the answers.
router network
asked 8 hours ago
DigosDigos
133
New contributor
Digos is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
The RFC 4778 cover the Operational Security Practices in ISPs Environments back on 2007.
Among the best practices, a common one is Ingress Filtering on edge routers. In the above RFC, the author says the following:
Lack of consistency regarding the ability to filter, especially with
respect to performance issues, cause some ISPs not to implement BCP38
and BCP84 guidelines for ingress filtering. One such example is at
edge boxes, where up to 1000 T1s connecting into a router with an
OC-12 (Optical Carrier) uplink. Some deployed devices experience a
large performance impact with filtering, which is unacceptable for
passing customer traffic through, though ingress filtering (uRPF)
might be applicable at the devices that are connecting these
aggregation routers. Where performance is not an issue, the ISPs
make a tradeoff between management versus risk.
Is the impact on performance nowadays a concern among network operators to not deploy ingress filtering on their networks? Is there anything else to worry about? Can you provide some kind of evidence to support your argument?
Thank you all for the answers.
router network
asked 8 hours ago
DigosDigos
133
New contributor
Digos is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
The RFC 4778 cover the Operational Security Practices in ISPs Environments back on 2007.
Among the best practices, a common one is Ingress Filtering on edge routers. In the above RFC, the author says the following:
Lack of consistency regarding the ability to filter, especially with
respect to performance issues, cause some ISPs not to implement BCP38
and BCP84 guidelines for ingress filtering. One such example is at
edge boxes, where up to 1000 T1s connecting into a router with an
OC-12 (Optical Carrier) uplink. Some deployed devices experience a
large performance impact with filtering, which is unacceptable for
passing customer traffic through, though ingress filtering (uRPF)
might be applicable at the devices that are connecting these
aggregation routers. Where performance is not an issue, the ISPs
make a tradeoff between management versus risk.
Is the impact on performance nowadays a concern among network operators to not deploy ingress filtering on their networks? Is there anything else to worry about? Can you provide some kind of evidence to support your argument?
Thank you all for the answers.
router network
router network
asked 8 hours ago
DigosDigos
133
New contributor
Digos is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 8 hours ago
DigosDigos
133
New contributor
Digos is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 1 hour ago
Digos
asked 8 hours ago
DigosDigos
133
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asked 8 hours ago
DigosDigos
133
asked 8 hours ago
DigosDigos
133
133
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1 Answer
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A lot depends on the particular router model. Most newer, high performance routers can filter in hardware - meaning they can filter at line rate. So there's no performance impact. But a lot of ISPs (and other places too) use older equipment (even from 2007) because "why change if it works?"
For management risk, every ISP decides, consciously or unconsciously, how much risk is involved in maintaining those access lists -- how often they need to change, how they test, what is the impact of making a mistake, etc.
answered 8 hours ago
Ron TrunkRon Trunk
42.2k33987
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1 Answer
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1 Answer
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A lot depends on the particular router model. Most newer, high performance routers can filter in hardware - meaning they can filter at line rate. So there's no performance impact. But a lot of ISPs (and other places too) use older equipment (even from 2007) because "why change if it works?"
For management risk, every ISP decides, consciously or unconsciously, how much risk is involved in maintaining those access lists -- how often they need to change, how they test, what is the impact of making a mistake, etc.
answered 8 hours ago
Ron TrunkRon Trunk
42.2k33987
add a comment |
A lot depends on the particular router model. Most newer, high performance routers can filter in hardware - meaning they can filter at line rate. So there's no performance impact. But a lot of ISPs (and other places too) use older equipment (even from 2007) because "why change if it works?"
For management risk, every ISP decides, consciously or unconsciously, how much risk is involved in maintaining those access lists -- how often they need to change, how they test, what is the impact of making a mistake, etc.
answered 8 hours ago
Ron TrunkRon Trunk
42.2k33987
add a comment |
A lot depends on the particular router model. Most newer, high performance routers can filter in hardware - meaning they can filter at line rate. So there's no performance impact. But a lot of ISPs (and other places too) use older equipment (even from 2007) because "why change if it works?"
For management risk, every ISP decides, consciously or unconsciously, how much risk is involved in maintaining those access lists -- how often they need to change, how they test, what is the impact of making a mistake, etc.
answered 8 hours ago
Ron TrunkRon Trunk
42.2k33987
A lot depends on the particular router model. Most newer, high performance routers can filter in hardware - meaning they can filter at line rate. So there's no performance impact. But a lot of ISPs (and other places too) use older equipment (even from 2007) because "why change if it works?"
For management risk, every ISP decides, consciously or unconsciously, how much risk is involved in maintaining those access lists -- how often they need to change, how they test, what is the impact of making a mistake, etc.
answered 8 hours ago
Ron TrunkRon Trunk
42.2k33987
answered 8 hours ago
Ron TrunkRon Trunk
42.2k33987
answered 8 hours ago
Ron TrunkRon Trunk
42.2k33987
answered 8 hours ago
Ron TrunkRon Trunk
42.2k33987
42.2k33987
add a comment |
add a comment |
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