☰

net.ipv6.conf.all.forwarding=1은 모든 개별 인터페이스에 대한 전달을 활성화하는 데 해당합니까?

tag-icon • tag-icon linux networking routing ipv6 forwarding
net.ipv6.conf.all.forwarding=1은 모든 개별 인터페이스에 대한 전달을 활성화하는 데 해당합니까?

아니면 이것이 IPv6 전달을 활성화하는 유일한 방법입니까?

/proc/sys/net/ipv6/conf# grep '' */forwarding
all/forwarding:0
default/forwarding:1
eth0/forwarding:1
lo/forwarding:1
nat64/forwarding:1
tunl0/forwarding:1
veth_cm/forwarding:1
wifi0/forwarding:1
wlan0/forwarding:1

라우팅되지 않았습니다. Wireshark에서 패킷을 볼 수 있지만 ip6table에 도달하지 않습니다.

/proc/sys/net/ipv6/conf# grep '' */forwarding
all/forwarding:1
default/forwarding:1
eth0/forwarding:1
lo/forwarding:1
nat64/forwarding:1
tunl0/forwarding:1
veth_cm/forwarding:1
wifi0/forwarding:1
wlan0/forwarding:1

이제 네트워크가 작동하기 시작합니다.

/proc/sys/net/ipv6/conf# grep '' */forwarding
all/forwarding:1
default/forwarding:0
eth0/forwarding:0
lo/forwarding:0
nat64/forwarding:0
tunl0/forwarding:0
veth_cm/forwarding:0
wifi0/forwarding:0
wlan0/forwarding:0

네트워크는 여전히 작동합니다. 별도의 인터페이스별 스위치가 사용됩니까? Linux 커널 버그(현재 실행 중인 버전 4.9.5)일 수 있습니다.

답변1

*/forwardingIPv4와 다르게 작동하도록 설계된 것처럼 보입니다 all/forwarding.

~에서https://www.kernel.org/doc/Documentation/networking/ip-sysctl.txt:

conf/all/forwarding - BOOLEAN
    Enable global IPv6 forwarding between all interfaces.

    IPv4 and IPv6 work differently here; e.g. netfilter must be used
    to control which interfaces may forward packets and which not.

    This also sets all interfaces' Host/Router setting
    'forwarding' to the specified value.  See below for details.

    This referred to as global forwarding.

forwarding - INTEGER
    Configure interface-specific Host/Router behaviour.

    Note: It is recommended to have the same setting on all
    interfaces; mixed router/host scenarios are rather uncommon.

    Possible values are:
        0 Forwarding disabled
        1 Forwarding enabled

    FALSE (0):

    By default, Host behaviour is assumed.  This means:

    1. IsRouter flag is not set in Neighbour Advertisements.
    2. If accept_ra is TRUE (default), transmit Router
       Solicitations.
    3. If accept_ra is TRUE (default), accept Router
       Advertisements (and do autoconfiguration).
    4. If accept_redirects is TRUE (default), accept Redirects.

    TRUE (1):

    If local forwarding is enabled, Router behaviour is assumed.
    This means exactly the reverse from the above:

    1. IsRouter flag is set in Neighbour Advertisements.
    2. Router Solicitations are not sent unless accept_ra is 2.
    3. Router Advertisements are ignored unless accept_ra is 2.
    4. Redirects are ignored.

    Default: 0 (disabled) if global forwarding is disabled (default),
         otherwise 1 (enabled).

따라서 각 인터페이스는 forwarding각종 플래그, 특수 패킷 동작 등의 보조 기능에만 사용되며, 패킷 재전송 여부를 결정하는 데에는 사용되지 않습니다.

관련 정보