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Does routing table work like a per-IP-address firewall, while iptables work like a per-port firewall?

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0

I heard that in a routing table, we can drop packets. Does that work like a per-IP-address firewall to prevent access to certain range of IP addresses from the local device?

In comparison, does iptables work as a per-port firewall to prevent access to certain port from the local device?

Thanks.

iptables routing firewall

share|improve this question

edited Mar 28 at 14:11

Tim

asked Mar 28 at 12:38

TimTim

28.5k79269491

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Do you have a reference for the “I heard that ...” part? Regarding iptables, have you considered the usefulness or otherwise of the -s and -d parameters?
  
  – Stephen Kitt
  Mar 28 at 13:57
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  How does a per-IP-address firewall work? How does a per-port firewall work? I do not believe it is possible to block local system connections to local ports using iptables. I can't think of a use case where it would be necessary to actively block/drop/deny access from a local process to a local port. It sounds like you are discussing using network level activities to try and restrict system process functions. That dog won't hunt.
  
  – 0xSheepdog
  Mar 28 at 14:33
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @StephenKitt Yes, I have. See my update.
  
  – Tim
  Mar 28 at 15:11
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @Tim so why would iptables support specifying source and/or destination addresses if it’s a per-port firewall (whatever that means)?
  
  – Stephen Kitt
  Mar 28 at 15:31
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Does a "per-port firewall" mean anything? What?
  
  – mosvy
  Mar 28 at 19:24
  

  
  
  
  

add a comment | 

0

I heard that in a routing table, we can drop packets. Does that work like a per-IP-address firewall to prevent access to certain range of IP addresses from the local device?

In comparison, does iptables work as a per-port firewall to prevent access to certain port from the local device?

Thanks.

iptables routing firewall

share|improve this question

edited Mar 28 at 14:11

Tim

asked Mar 28 at 12:38

TimTim

28.5k79269491

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Do you have a reference for the “I heard that ...” part? Regarding iptables, have you considered the usefulness or otherwise of the -s and -d parameters?
  
  – Stephen Kitt
  Mar 28 at 13:57
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  How does a per-IP-address firewall work? How does a per-port firewall work? I do not believe it is possible to block local system connections to local ports using iptables. I can't think of a use case where it would be necessary to actively block/drop/deny access from a local process to a local port. It sounds like you are discussing using network level activities to try and restrict system process functions. That dog won't hunt.
  
  – 0xSheepdog
  Mar 28 at 14:33
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @StephenKitt Yes, I have. See my update.
  
  – Tim
  Mar 28 at 15:11
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @Tim so why would iptables support specifying source and/or destination addresses if it’s a per-port firewall (whatever that means)?
  
  – Stephen Kitt
  Mar 28 at 15:31
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Does a "per-port firewall" mean anything? What?
  
  – mosvy
  Mar 28 at 19:24
  

  
  
  
  

add a comment | 

I heard that in a routing table, we can drop packets. Does that work like a per-IP-address firewall to prevent access to certain range of IP addresses from the local device?

In comparison, does iptables work as a per-port firewall to prevent access to certain port from the local device?

Thanks.

iptables routing firewall

share|improve this question

edited Mar 28 at 14:11

Tim

asked Mar 28 at 12:38

TimTim

28.5k79269491

share|improve this question

edited Mar 28 at 14:11

Tim

asked Mar 28 at 12:38

TimTim

28.5k79269491

share|improve this question

edited Mar 28 at 14:11

Tim

asked Mar 28 at 12:38

TimTim

28.5k79269491

asked Mar 28 at 12:38

TimTim

28.5k79269491

asked Mar 28 at 12:38

TimTim

28.5k79269491