Does 0.0.0.0/7 represent the same range as 1.0.0.0/8?











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The range of 0.0.0.0/7 is 0.0.0.0 - 1.255.255.255.

The range of 1.0.0.0/8 is 1.0.0.0 - 1.255.255.255.



AFAIK, 0.0.0.0/8 (0.0.0.0 - 0.255.255.255) is not usable. So, do these represent the same range practically?



ip route add 0.0.0.0/7 dev eth1 # 1

ip route add 1.0.0.0/8 dev eth1 # 2


Is the effect the same?






networking routing ip cidr







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  • 1




    I get it now, but I suspect you should also read this.
    – Michael Hampton♦
    Nov 5 at 17:23










  • @MichaelHampton +1 for the link. Edited the post.
    – Szymon Marczak
    Nov 5 at 17:41















up vote
3
down vote

favorite












The range of 0.0.0.0/7 is 0.0.0.0 - 1.255.255.255.

The range of 1.0.0.0/8 is 1.0.0.0 - 1.255.255.255.



AFAIK, 0.0.0.0/8 (0.0.0.0 - 0.255.255.255) is not usable. So, do these represent the same range practically?



ip route add 0.0.0.0/7 dev eth1 # 1

ip route add 1.0.0.0/8 dev eth1 # 2


Is the effect the same?






networking routing ip cidr







share|improve this question




















  • 1




    I get it now, but I suspect you should also read this.
    – Michael Hampton♦
    Nov 5 at 17:23










  • @MichaelHampton +1 for the link. Edited the post.
    – Szymon Marczak
    Nov 5 at 17:41













up vote
3
down vote

favorite









up vote
3
down vote

favorite











The range of 0.0.0.0/7 is 0.0.0.0 - 1.255.255.255.

The range of 1.0.0.0/8 is 1.0.0.0 - 1.255.255.255.



AFAIK, 0.0.0.0/8 (0.0.0.0 - 0.255.255.255) is not usable. So, do these represent the same range practically?



ip route add 0.0.0.0/7 dev eth1 # 1

ip route add 1.0.0.0/8 dev eth1 # 2


Is the effect the same?






networking routing ip cidr







share|improve this question















The range of 0.0.0.0/7 is 0.0.0.0 - 1.255.255.255.

The range of 1.0.0.0/8 is 1.0.0.0 - 1.255.255.255.



AFAIK, 0.0.0.0/8 (0.0.0.0 - 0.255.255.255) is not usable. So, do these represent the same range practically?



ip route add 0.0.0.0/7 dev eth1 # 1

ip route add 1.0.0.0/8 dev eth1 # 2


Is the effect the same?






networking routing ip cidr




networking routing ip cidr






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Nov 5 at 17:36

























asked Nov 5 at 16:55









Szymon Marczak

1186




1186








  • 1




    I get it now, but I suspect you should also read this.
    – Michael Hampton♦
    Nov 5 at 17:23










  • @MichaelHampton +1 for the link. Edited the post.
    – Szymon Marczak
    Nov 5 at 17:41














  • 1




    I get it now, but I suspect you should also read this.
    – Michael Hampton♦
    Nov 5 at 17:23










  • @MichaelHampton +1 for the link. Edited the post.
    – Szymon Marczak
    Nov 5 at 17:41








1




1




I get it now, but I suspect you should also read this.
– Michael Hampton♦
Nov 5 at 17:23




I get it now, but I suspect you should also read this.
– Michael Hampton♦
Nov 5 at 17:23












@MichaelHampton +1 for the link. Edited the post.
– Szymon Marczak
Nov 5 at 17:41




@MichaelHampton +1 for the link. Edited the post.
– Szymon Marczak
Nov 5 at 17:41










1 Answer
1






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7
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Clearly these are not the same.



However, nothing in 0.0.0.0/8 is a valid destination address, so the effect of each route would be the same. Attempts to connect to anything in 0.0.0.0/8 would just fail as always with an Invalid argument error, while attempts to connect to 1.0.0.0/8 would be routed as specified.






share|improve this answer





















  • Just to add to this, if you specify both routes, 1.0.0.0/8 would always be used for 1.*.*.*, as it is more specific than 0.0.0.0/7. Hence, 0.0.0.0/7 would be used (and fail as described) only for 0.0.0.0/8 range (0.*.*.* addresses).
    – Matija Nalis
    Nov 5 at 20:36










  • @MatijaNalis Connections to 0.0.0.0/8 fail regardless of whether a static route is defined for them or not.
    – Michael Hampton♦
    Nov 5 at 20:38













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1 Answer
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active

oldest

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1 Answer
1






active

oldest

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active

oldest

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active

oldest

votes








up vote
7
down vote



accepted










Clearly these are not the same.



However, nothing in 0.0.0.0/8 is a valid destination address, so the effect of each route would be the same. Attempts to connect to anything in 0.0.0.0/8 would just fail as always with an Invalid argument error, while attempts to connect to 1.0.0.0/8 would be routed as specified.






share|improve this answer





















  • Just to add to this, if you specify both routes, 1.0.0.0/8 would always be used for 1.*.*.*, as it is more specific than 0.0.0.0/7. Hence, 0.0.0.0/7 would be used (and fail as described) only for 0.0.0.0/8 range (0.*.*.* addresses).
    – Matija Nalis
    Nov 5 at 20:36










  • @MatijaNalis Connections to 0.0.0.0/8 fail regardless of whether a static route is defined for them or not.
    – Michael Hampton♦
    Nov 5 at 20:38

















up vote
7
down vote



accepted










Clearly these are not the same.



However, nothing in 0.0.0.0/8 is a valid destination address, so the effect of each route would be the same. Attempts to connect to anything in 0.0.0.0/8 would just fail as always with an Invalid argument error, while attempts to connect to 1.0.0.0/8 would be routed as specified.






share|improve this answer





















  • Just to add to this, if you specify both routes, 1.0.0.0/8 would always be used for 1.*.*.*, as it is more specific than 0.0.0.0/7. Hence, 0.0.0.0/7 would be used (and fail as described) only for 0.0.0.0/8 range (0.*.*.* addresses).
    – Matija Nalis
    Nov 5 at 20:36










  • @MatijaNalis Connections to 0.0.0.0/8 fail regardless of whether a static route is defined for them or not.
    – Michael Hampton♦
    Nov 5 at 20:38















up vote
7
down vote



accepted







up vote
7
down vote



accepted






Clearly these are not the same.



However, nothing in 0.0.0.0/8 is a valid destination address, so the effect of each route would be the same. Attempts to connect to anything in 0.0.0.0/8 would just fail as always with an Invalid argument error, while attempts to connect to 1.0.0.0/8 would be routed as specified.






share|improve this answer












Clearly these are not the same.



However, nothing in 0.0.0.0/8 is a valid destination address, so the effect of each route would be the same. Attempts to connect to anything in 0.0.0.0/8 would just fail as always with an Invalid argument error, while attempts to connect to 1.0.0.0/8 would be routed as specified.







share|improve this answer












share|improve this answer



share|improve this answer










answered Nov 5 at 17:22









Michael Hampton♦

161k26297607




161k26297607












  • Just to add to this, if you specify both routes, 1.0.0.0/8 would always be used for 1.*.*.*, as it is more specific than 0.0.0.0/7. Hence, 0.0.0.0/7 would be used (and fail as described) only for 0.0.0.0/8 range (0.*.*.* addresses).
    – Matija Nalis
    Nov 5 at 20:36










  • @MatijaNalis Connections to 0.0.0.0/8 fail regardless of whether a static route is defined for them or not.
    – Michael Hampton♦
    Nov 5 at 20:38




















  • Just to add to this, if you specify both routes, 1.0.0.0/8 would always be used for 1.*.*.*, as it is more specific than 0.0.0.0/7. Hence, 0.0.0.0/7 would be used (and fail as described) only for 0.0.0.0/8 range (0.*.*.* addresses).
    – Matija Nalis
    Nov 5 at 20:36










  • @MatijaNalis Connections to 0.0.0.0/8 fail regardless of whether a static route is defined for them or not.
    – Michael Hampton♦
    Nov 5 at 20:38


















Just to add to this, if you specify both routes, 1.0.0.0/8 would always be used for 1.*.*.*, as it is more specific than 0.0.0.0/7. Hence, 0.0.0.0/7 would be used (and fail as described) only for 0.0.0.0/8 range (0.*.*.* addresses).
– Matija Nalis
Nov 5 at 20:36




Just to add to this, if you specify both routes, 1.0.0.0/8 would always be used for 1.*.*.*, as it is more specific than 0.0.0.0/7. Hence, 0.0.0.0/7 would be used (and fail as described) only for 0.0.0.0/8 range (0.*.*.* addresses).
– Matija Nalis
Nov 5 at 20:36












@MatijaNalis Connections to 0.0.0.0/8 fail regardless of whether a static route is defined for them or not.
– Michael Hampton♦
Nov 5 at 20:38






@MatijaNalis Connections to 0.0.0.0/8 fail regardless of whether a static route is defined for them or not.
– Michael Hampton♦
Nov 5 at 20:38




















 

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