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dev-docs: set an MTU on the VPN route (#3239)
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@ -39,4 +39,6 @@ app.kubernetes.io/instance: {{ .Release.Name }}
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value: {{ .Values.serviceCIDR | quote }}
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- name: VPN_FRONTEND_POD
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value: {{ include "..fullname" . }}-frontend-0
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- name: VPN_MTU
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value: {{ .Values.mtu | quote }}
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{{- end }}
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@ -8,6 +8,10 @@ serviceCIDR: "10.96.0.0/12"
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# on-prem IP ranges to expose to Constellation. Must contain at least one CIDR.
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peerCIDRs: []
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# MTU to set on the VPN route. Leave empty if path MTU discovery is supported end-to-end.
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# See also https://docs.strongswan.org/docs/5.9/howtos/forwarding.html#_mtumss_issues.
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mtu: 1300
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# IPSec configuration
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ipsec:
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# pre-shared key used for authentication
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@ -15,4 +19,4 @@ ipsec:
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# Address of the peer's gateway router.
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peer: ""
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image: "ghcr.io/edgelesssys/constellation/vpn@sha256:34e28ced172d04dfdadaadbefb1a53b5857cb24fb24e275fbbc537f3639a789e"
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image: "ghcr.io/edgelesssys/constellation/vpn@sha256:88b6a0265052cb0a68d20d9b20e0d42ef15e7a80e5f71201ecf32e004de2356e"
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@ -30,10 +30,17 @@ reconcile_sip_verification() {
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fi
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}
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optional_mtu() {
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if [ -n "${VPN_MTU}" ]; then
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printf "mtu %s" "${VPN_MTU}"
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fi
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}
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# Set up the route from the node network namespace to the VPN pod.
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reconcile_route() {
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for cidr in ${VPN_PEER_CIDRS}; do
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nsenter -t 1 -n ip route replace "${cidr}" via "$(myip)"
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# shellcheck disable=SC2046 # Word splitting is intentional here.
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nsenter -t 1 -n ip route replace "${cidr}" via "$(myip)" $(optional_mtu)
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done
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}
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